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Finding the Fourth Proportional to 9,387.78, 14,080.20 and 3,147.90

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Solution

The fourth proportional to 9,387.78, 14,080.20 and 3,147.90 is: 4,721.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,387.78 : 14,080.20 = 3,147.90 : x
  2. Step 2: Convert to fraction form
    9,387.78/14,080.20 = 3,147.90/x
  3. Step 3: Cross multiply
    9,387.78x = 14,080.20 × 3,147.90
  4. Step 4: Simplify right side
    9,387.78x = 44,323,061.58
  5. Step 5: Solve for x
    x = 44,323,061.58/9,387.78
  6. Step 6: Final answer
    x = 4,721.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.