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Finding the Fourth Proportional to 439.44, 660.46 and 257.18

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Solution

The fourth proportional to 439.44, 660.46 and 257.18 is: 386.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.44 : 660.46 = 257.18 : x
  2. Step 2: Convert to fraction form
    439.44/660.46 = 257.18/x
  3. Step 3: Cross multiply
    439.44x = 660.46 × 257.18
  4. Step 4: Simplify right side
    439.44x = 169,857.10
  5. Step 5: Solve for x
    x = 169,857.10/439.44
  6. Step 6: Final answer
    x = 386.53

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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.