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Finding the Fourth Proportional to 8,679.62, 12,989.80 and 5,515.46

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Solution

The fourth proportional to 8,679.62, 12,989.80 and 5,515.46 is: 8,254.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.62 : 12,989.80 = 5,515.46 : x
  2. Step 2: Convert to fraction form
    8,679.62/12,989.80 = 5,515.46/x
  3. Step 3: Cross multiply
    8,679.62x = 12,989.80 × 5,515.46
  4. Step 4: Simplify right side
    8,679.62x = 71,644,712.97
  5. Step 5: Solve for x
    x = 71,644,712.97/8,679.62
  6. Step 6: Final answer
    x = 8,254.36

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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.