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Finding the Fourth Proportional to 18,752.40, 28,142.43 and 8,891.72

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Solution

The fourth proportional to 18,752.40, 28,142.43 and 8,891.72 is: 13,344.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,752.40 : 28,142.43 = 8,891.72 : x
  2. Step 2: Convert to fraction form
    18,752.40/28,142.43 = 8,891.72/x
  3. Step 3: Cross multiply
    18,752.40x = 28,142.43 × 8,891.72
  4. Step 4: Simplify right side
    18,752.40x = 250,234,466.97
  5. Step 5: Solve for x
    x = 250,234,466.97/18,752.40
  6. Step 6: Final answer
    x = 13,344.13

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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.