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Finding the Fourth Proportional to 65,866,991.92, 90,866,640.91 and 39,753,162.16

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Solution

The fourth proportional to 65,866,991.92, 90,866,640.91 and 39,753,162.16 is: 54,841,373.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,866,991.92 : 90,866,640.91 = 39,753,162.16 : x
  2. Step 2: Convert to fraction form
    65,866,991.92/90,866,640.91 = 39,753,162.16/x
  3. Step 3: Cross multiply
    65,866,991.92x = 90,866,640.91 × 39,753,162.16
  4. Step 4: Simplify right side
    65,866,991.92x = 3,612,236,310,376,621
  5. Step 5: Solve for x
    x = 3,612,236,310,376,621/65,866,991.92
  6. Step 6: Final answer
    x = 54,841,373.58

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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.