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Finding the Fourth Proportional to 90,675,689.70, 136,013,534.55 and 85,006,985.70

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Solution

The fourth proportional to 90,675,689.70, 136,013,534.55 and 85,006,985.70 is: 127,510,478.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,675,689.70 : 136,013,534.55 = 85,006,985.70 : x
  2. Step 2: Convert to fraction form
    90,675,689.70/136,013,534.55 = 85,006,985.70/x
  3. Step 3: Cross multiply
    90,675,689.70x = 136,013,534.55 × 85,006,985.70
  4. Step 4: Simplify right side
    90,675,689.70x = 11,562,100,586,498,308
  5. Step 5: Solve for x
    x = 11,562,100,586,498,308/90,675,689.70
  6. Step 6: Final answer
    x = 127,510,478.55

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.