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Finding the Fourth Proportional to 71,720.74, 98,978.13 and 39,888.96

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Solution

The fourth proportional to 71,720.74, 98,978.13 and 39,888.96 is: 55,048.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.74 : 98,978.13 = 39,888.96 : x
  2. Step 2: Convert to fraction form
    71,720.74/98,978.13 = 39,888.96/x
  3. Step 3: Cross multiply
    71,720.74x = 98,978.13 × 39,888.96
  4. Step 4: Simplify right side
    71,720.74x = 3,948,134,668.44
  5. Step 5: Solve for x
    x = 3,948,134,668.44/71,720.74
  6. Step 6: Final answer
    x = 55,048.72

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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.