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Finding the Fourth Proportional to 18,872.48, 28,305.12 and 7,186.88

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Solution

The fourth proportional to 18,872.48, 28,305.12 and 7,186.88 is: 10,778.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.48 : 28,305.12 = 7,186.88 : x
  2. Step 2: Convert to fraction form
    18,872.48/28,305.12 = 7,186.88/x
  3. Step 3: Cross multiply
    18,872.48x = 28,305.12 × 7,186.88
  4. Step 4: Simplify right side
    18,872.48x = 203,425,500.83
  5. Step 5: Solve for x
    x = 203,425,500.83/18,872.48
  6. Step 6: Final answer
    x = 10,778.95

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1.5x scale

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.