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Finding the Fourth Proportional to 12,658.10, 18,987.15 and 8,429.90

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Solution

The fourth proportional to 12,658.10, 18,987.15 and 8,429.90 is: 12,644.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.10 : 18,987.15 = 8,429.90 : x
  2. Step 2: Convert to fraction form
    12,658.10/18,987.15 = 8,429.90/x
  3. Step 3: Cross multiply
    12,658.10x = 18,987.15 × 8,429.90
  4. Step 4: Simplify right side
    12,658.10x = 160,059,775.79
  5. Step 5: Solve for x
    x = 160,059,775.79/12,658.10
  6. Step 6: Final answer
    x = 12,644.85

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Similar ratio
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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.