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Finding the Fourth Proportional to 28,340.39, 42,479.39 and 11,691.31

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Solution

The fourth proportional to 28,340.39, 42,479.39 and 11,691.31 is: 17,524.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,340.39 : 42,479.39 = 11,691.31 : x
  2. Step 2: Convert to fraction form
    28,340.39/42,479.39 = 11,691.31/x
  3. Step 3: Cross multiply
    28,340.39x = 42,479.39 × 11,691.31
  4. Step 4: Simplify right side
    28,340.39x = 496,639,717.10
  5. Step 5: Solve for x
    x = 496,639,717.10/28,340.39
  6. Step 6: Final answer
    x = 17,524.10

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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.