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Finding the Fourth Proportional to 18,489.80, 27,715.80 and 9,115.40

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Solution

The fourth proportional to 18,489.80, 27,715.80 and 9,115.40 is: 13,663.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.80 : 27,715.80 = 9,115.40 : x
  2. Step 2: Convert to fraction form
    18,489.80/27,715.80 = 9,115.40/x
  3. Step 3: Cross multiply
    18,489.80x = 27,715.80 × 9,115.40
  4. Step 4: Simplify right side
    18,489.80x = 252,640,603.32
  5. Step 5: Solve for x
    x = 252,640,603.32/18,489.80
  6. Step 6: Final answer
    x = 13,663.78

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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.