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Finding the Fourth Proportional to 439.47, 659.16 and 147.15

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Solution

The fourth proportional to 439.47, 659.16 and 147.15 is: 220.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.47 : 659.16 = 147.15 : x
  2. Step 2: Convert to fraction form
    439.47/659.16 = 147.15/x
  3. Step 3: Cross multiply
    439.47x = 659.16 × 147.15
  4. Step 4: Simplify right side
    439.47x = 96,995.39
  5. Step 5: Solve for x
    x = 96,995.39/439.47
  6. Step 6: Final answer
    x = 220.71

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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.