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Finding the Fourth Proportional to 18,123.11, 27,162.35 and 8,640.42

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Solution

The fourth proportional to 18,123.11, 27,162.35 and 8,640.42 is: 12,949.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,123.11 : 27,162.35 = 8,640.42 : x
  2. Step 2: Convert to fraction form
    18,123.11/27,162.35 = 8,640.42/x
  3. Step 3: Cross multiply
    18,123.11x = 27,162.35 × 8,640.42
  4. Step 4: Simplify right side
    18,123.11x = 234,693,933.17
  5. Step 5: Solve for x
    x = 234,693,933.17/18,123.11
  6. Step 6: Final answer
    x = 12,949.98

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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.