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Finding the Fourth Proportional to 439.67, 659.64 and 147.20

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Solution

The fourth proportional to 439.67, 659.64 and 147.20 is: 220.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.67 : 659.64 = 147.20 : x
  2. Step 2: Convert to fraction form
    439.67/659.64 = 147.20/x
  3. Step 3: Cross multiply
    439.67x = 659.64 × 147.20
  4. Step 4: Simplify right side
    439.67x = 97,094.97
  5. Step 5: Solve for x
    x = 97,094.97/439.67
  6. Step 6: Final answer
    x = 220.84

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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.