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Finding the Fourth Proportional to 28,371.60, 42,581.70 and 12,600.90

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Solution

The fourth proportional to 28,371.60, 42,581.70 and 12,600.90 is: 18,912.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,371.60 : 42,581.70 = 12,600.90 : x
  2. Step 2: Convert to fraction form
    28,371.60/42,581.70 = 12,600.90/x
  3. Step 3: Cross multiply
    28,371.60x = 42,581.70 × 12,600.90
  4. Step 4: Simplify right side
    28,371.60x = 536,567,743.53
  5. Step 5: Solve for x
    x = 536,567,743.53/28,371.60
  6. Step 6: Final answer
    x = 18,912.14

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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.