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Finding the Fourth Proportional to 10,989.12, 16,472.16 and 4,747.20

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Solution

The fourth proportional to 10,989.12, 16,472.16 and 4,747.20 is: 7,115.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,989.12 : 16,472.16 = 4,747.20 : x
  2. Step 2: Convert to fraction form
    10,989.12/16,472.16 = 4,747.20/x
  3. Step 3: Cross multiply
    10,989.12x = 16,472.16 × 4,747.20
  4. Step 4: Simplify right side
    10,989.12x = 78,196,637.95
  5. Step 5: Solve for x
    x = 78,196,637.95/10,989.12
  6. Step 6: Final answer
    x = 7,115.82

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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.