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Finding the Fourth Proportional to 439.31, 659.28 and 165.57

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Solution

The fourth proportional to 439.31, 659.28 and 165.57 is: 248.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.31 : 659.28 = 165.57 : x
  2. Step 2: Convert to fraction form
    439.31/659.28 = 165.57/x
  3. Step 3: Cross multiply
    439.31x = 659.28 × 165.57
  4. Step 4: Simplify right side
    439.31x = 109,156.99
  5. Step 5: Solve for x
    x = 109,156.99/439.31
  6. Step 6: Final answer
    x = 248.48

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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.