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Finding the Fourth Proportional to 90,625.90, 135,938.85 and 65,613.10

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Solution

The fourth proportional to 90,625.90, 135,938.85 and 65,613.10 is: 98,419.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,625.90 : 135,938.85 = 65,613.10 : x
  2. Step 2: Convert to fraction form
    90,625.90/135,938.85 = 65,613.10/x
  3. Step 3: Cross multiply
    90,625.90x = 135,938.85 × 65,613.10
  4. Step 4: Simplify right side
    90,625.90x = 8,919,369,358.94
  5. Step 5: Solve for x
    x = 8,919,369,358.94/90,625.90
  6. Step 6: Final answer
    x = 98,419.65

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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.