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Finding the Fourth Proportional to 439.12, 658.60 and 130.90

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Solution

The fourth proportional to 439.12, 658.60 and 130.90 is: 196.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.12 : 658.60 = 130.90 : x
  2. Step 2: Convert to fraction form
    439.12/658.60 = 130.90/x
  3. Step 3: Cross multiply
    439.12x = 658.60 × 130.90
  4. Step 4: Simplify right side
    439.12x = 86,210.74
  5. Step 5: Solve for x
    x = 86,210.74/439.12
  6. Step 6: Final answer
    x = 196.33

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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.