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Finding the Fourth Proportional to 659.12, 987.53 and 439.61

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Solution

The fourth proportional to 659.12, 987.53 and 439.61 is: 658.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.12 : 987.53 = 439.61 : x
  2. Step 2: Convert to fraction form
    659.12/987.53 = 439.61/x
  3. Step 3: Cross multiply
    659.12x = 987.53 × 439.61
  4. Step 4: Simplify right side
    659.12x = 434,120.93
  5. Step 5: Solve for x
    x = 434,120.93/659.12
  6. Step 6: Final answer
    x = 658.64

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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.