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Finding the Fourth Proportional to 66,242.68, 91,410.28 and 39,387.40

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Solution

The fourth proportional to 66,242.68, 91,410.28 and 39,387.40 is: 54,351.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,242.68 : 91,410.28 = 39,387.40 : x
  2. Step 2: Convert to fraction form
    66,242.68/91,410.28 = 39,387.40/x
  3. Step 3: Cross multiply
    66,242.68x = 91,410.28 × 39,387.40
  4. Step 4: Simplify right side
    66,242.68x = 3,600,413,262.47
  5. Step 5: Solve for x
    x = 3,600,413,262.47/66,242.68
  6. Step 6: Final answer
    x = 54,351.87

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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.