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Finding the Fourth Proportional to 12,381.52, 18,555.85 and 9,079.15

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Solution

The fourth proportional to 12,381.52, 18,555.85 and 9,079.15 is: 13,606.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,381.52 : 18,555.85 = 9,079.15 : x
  2. Step 2: Convert to fraction form
    12,381.52/18,555.85 = 9,079.15/x
  3. Step 3: Cross multiply
    12,381.52x = 18,555.85 × 9,079.15
  4. Step 4: Simplify right side
    12,381.52x = 168,471,345.53
  5. Step 5: Solve for x
    x = 168,471,345.53/12,381.52
  6. Step 6: Final answer
    x = 13,606.68

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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.