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Finding the Fourth Proportional to 71,731.30, 98,988.91 and 39,900.21

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Solution

The fourth proportional to 71,731.30, 98,988.91 and 39,900.21 is: 55,062.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,731.30 : 98,988.91 = 39,900.21 : x
  2. Step 2: Convert to fraction form
    71,731.30/98,988.91 = 39,900.21/x
  3. Step 3: Cross multiply
    71,731.30x = 98,988.91 × 39,900.21
  4. Step 4: Simplify right side
    71,731.30x = 3,949,678,296.67
  5. Step 5: Solve for x
    x = 3,949,678,296.67/71,731.30
  6. Step 6: Final answer
    x = 55,062.13

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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.