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Finding the Fourth Proportional to 28,517.92, 42,748.16 and 11,887.16

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Solution

The fourth proportional to 28,517.92, 42,748.16 and 11,887.16 is: 17,818.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,517.92 : 42,748.16 = 11,887.16 : x
  2. Step 2: Convert to fraction form
    28,517.92/42,748.16 = 11,887.16/x
  3. Step 3: Cross multiply
    28,517.92x = 42,748.16 × 11,887.16
  4. Step 4: Simplify right side
    28,517.92x = 508,153,944.45
  5. Step 5: Solve for x
    x = 508,153,944.45/28,517.92
  6. Step 6: Final answer
    x = 17,818.76

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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.