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Finding the Fourth Proportional to 18,838.70, 28,238 and 8,957.10

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Solution

The fourth proportional to 18,838.70, 28,238 and 8,957.10 is: 13,426.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.70 : 28,238 = 8,957.10 : x
  2. Step 2: Convert to fraction form
    18,838.70/28,238 = 8,957.10/x
  3. Step 3: Cross multiply
    18,838.70x = 28,238 × 8,957.10
  4. Step 4: Simplify right side
    18,838.70x = 252,930,589.80
  5. Step 5: Solve for x
    x = 252,930,589.80/18,838.70
  6. Step 6: Final answer
    x = 13,426.12

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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.