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Finding the Fourth Proportional to 28,130.87, 38,819.17 and 15,553.19

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Solution

The fourth proportional to 28,130.87, 38,819.17 and 15,553.19 is: 21,462.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,130.87 : 38,819.17 = 15,553.19 : x
  2. Step 2: Convert to fraction form
    28,130.87/38,819.17 = 15,553.19/x
  3. Step 3: Cross multiply
    28,130.87x = 38,819.17 × 15,553.19
  4. Step 4: Simplify right side
    28,130.87x = 603,761,926.65
  5. Step 5: Solve for x
    x = 603,761,926.65/28,130.87
  6. Step 6: Final answer
    x = 21,462.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.