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Finding the Fourth Proportional to 8,981.28, 13,469.76 and 7,521.12

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Solution

The fourth proportional to 8,981.28, 13,469.76 and 7,521.12 is: 11,279.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,981.28 : 13,469.76 = 7,521.12 : x
  2. Step 2: Convert to fraction form
    8,981.28/13,469.76 = 7,521.12/x
  3. Step 3: Cross multiply
    8,981.28x = 13,469.76 × 7,521.12
  4. Step 4: Simplify right side
    8,981.28x = 101,307,681.33
  5. Step 5: Solve for x
    x = 101,307,681.33/8,981.28
  6. Step 6: Final answer
    x = 11,279.87

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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.