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Finding the Fourth Proportional to 28,479.71, 42,724.43 and 8,757.83

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Solution

The fourth proportional to 28,479.71, 42,724.43 and 8,757.83 is: 13,138.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.71 : 42,724.43 = 8,757.83 : x
  2. Step 2: Convert to fraction form
    28,479.71/42,724.43 = 8,757.83/x
  3. Step 3: Cross multiply
    28,479.71x = 42,724.43 × 8,757.83
  4. Step 4: Simplify right side
    28,479.71x = 374,173,037.38
  5. Step 5: Solve for x
    x = 374,173,037.38/28,479.71
  6. Step 6: Final answer
    x = 13,138.23

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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.