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Finding the Fourth Proportional to 71,390.31, 98,519.28 and 39,559.89

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Solution

The fourth proportional to 71,390.31, 98,519.28 and 39,559.89 is: 54,593.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,390.31 : 98,519.28 = 39,559.89 : x
  2. Step 2: Convert to fraction form
    71,390.31/98,519.28 = 39,559.89/x
  3. Step 3: Cross multiply
    71,390.31x = 98,519.28 × 39,559.89
  4. Step 4: Simplify right side
    71,390.31x = 3,897,411,879.68
  5. Step 5: Solve for x
    x = 3,897,411,879.68/71,390.31
  6. Step 6: Final answer
    x = 54,593.01

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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.