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Finding the Fourth Proportional to 71,641.56, 98,864.64 and 39,809.79

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Solution

The fourth proportional to 71,641.56, 98,864.64 and 39,809.79 is: 54,937.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,641.56 : 98,864.64 = 39,809.79 : x
  2. Step 2: Convert to fraction form
    71,641.56/98,864.64 = 39,809.79/x
  3. Step 3: Cross multiply
    71,641.56x = 98,864.64 × 39,809.79
  4. Step 4: Simplify right side
    71,641.56x = 3,935,780,556.83
  5. Step 5: Solve for x
    x = 3,935,780,556.83/71,641.56
  6. Step 6: Final answer
    x = 54,937.11

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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.