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Finding the Fourth Proportional to 85,853.82, 128,780.12 and 26,689.40

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Solution

The fourth proportional to 85,853.82, 128,780.12 and 26,689.40 is: 40,033.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,853.82 : 128,780.12 = 26,689.40 : x
  2. Step 2: Convert to fraction form
    85,853.82/128,780.12 = 26,689.40/x
  3. Step 3: Cross multiply
    85,853.82x = 128,780.12 × 26,689.40
  4. Step 4: Simplify right side
    85,853.82x = 3,437,064,134.73
  5. Step 5: Solve for x
    x = 3,437,064,134.73/85,853.82
  6. Step 6: Final answer
    x = 40,033.91

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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.