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Finding the Fourth Proportional to 439.65, 659.49 and 147.28

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Solution

The fourth proportional to 439.65, 659.49 and 147.28 is: 220.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.65 : 659.49 = 147.28 : x
  2. Step 2: Convert to fraction form
    439.65/659.49 = 147.28/x
  3. Step 3: Cross multiply
    439.65x = 659.49 × 147.28
  4. Step 4: Simplify right side
    439.65x = 97,128.95
  5. Step 5: Solve for x
    x = 97,128.95/439.65
  6. Step 6: Final answer
    x = 220.92

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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.