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Finding the Fourth Proportional to 66,128.49, 91,259.10 and 38,906.48

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Solution

The fourth proportional to 66,128.49, 91,259.10 and 38,906.48 is: 53,691.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,128.49 : 91,259.10 = 38,906.48 : x
  2. Step 2: Convert to fraction form
    66,128.49/91,259.10 = 38,906.48/x
  3. Step 3: Cross multiply
    66,128.49x = 91,259.10 × 38,906.48
  4. Step 4: Simplify right side
    66,128.49x = 3,550,569,892.67
  5. Step 5: Solve for x
    x = 3,550,569,892.67/66,128.49
  6. Step 6: Final answer
    x = 53,691.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.