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Finding the Fourth Proportional to 8,728.38, 13,078.40 and 8,404.79

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Solution

The fourth proportional to 8,728.38, 13,078.40 and 8,404.79 is: 12,593.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,728.38 : 13,078.40 = 8,404.79 : x
  2. Step 2: Convert to fraction form
    8,728.38/13,078.40 = 8,404.79/x
  3. Step 3: Cross multiply
    8,728.38x = 13,078.40 × 8,404.79
  4. Step 4: Simplify right side
    8,728.38x = 109,921,098.12
  5. Step 5: Solve for x
    x = 109,921,098.12/8,728.38
  6. Step 6: Final answer
    x = 12,593.53

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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.