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Finding the Fourth Proportional to 28,502.47, 42,716.04 and 20,631.30

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Solution

The fourth proportional to 28,502.47, 42,716.04 and 20,631.30 is: 30,919.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,502.47 : 42,716.04 = 20,631.30 : x
  2. Step 2: Convert to fraction form
    28,502.47/42,716.04 = 20,631.30/x
  3. Step 3: Cross multiply
    28,502.47x = 42,716.04 × 20,631.30
  4. Step 4: Simplify right side
    28,502.47x = 881,287,436.05
  5. Step 5: Solve for x
    x = 881,287,436.05/28,502.47
  6. Step 6: Final answer
    x = 30,919.69

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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.