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Finding the Fourth Proportional to 90,689.20, 136,179.60 and 65,903.20

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Solution

The fourth proportional to 90,689.20, 136,179.60 and 65,903.20 is: 98,960.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,689.20 : 136,179.60 = 65,903.20 : x
  2. Step 2: Convert to fraction form
    90,689.20/136,179.60 = 65,903.20/x
  3. Step 3: Cross multiply
    90,689.20x = 136,179.60 × 65,903.20
  4. Step 4: Simplify right side
    90,689.20x = 8,974,671,414.72
  5. Step 5: Solve for x
    x = 8,974,671,414.72/90,689.20
  6. Step 6: Final answer
    x = 98,960.75

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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.