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Finding the Fourth Proportional to 8,489.61, 12,729.79 and 2,942.49

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Solution

The fourth proportional to 8,489.61, 12,729.79 and 2,942.49 is: 4,412.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,489.61 : 12,729.79 = 2,942.49 : x
  2. Step 2: Convert to fraction form
    8,489.61/12,729.79 = 2,942.49/x
  3. Step 3: Cross multiply
    8,489.61x = 12,729.79 × 2,942.49
  4. Step 4: Simplify right side
    8,489.61x = 37,457,279.78
  5. Step 5: Solve for x
    x = 37,457,279.78/8,489.61
  6. Step 6: Final answer
    x = 4,412.13

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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.