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Finding the Fourth Proportional to 440.71, 660.85 and 258.17

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Solution

The fourth proportional to 440.71, 660.85 and 258.17 is: 387.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.71 : 660.85 = 258.17 : x
  2. Step 2: Convert to fraction form
    440.71/660.85 = 258.17/x
  3. Step 3: Cross multiply
    440.71x = 660.85 × 258.17
  4. Step 4: Simplify right side
    440.71x = 170,607.69
  5. Step 5: Solve for x
    x = 170,607.69/440.71
  6. Step 6: Final answer
    x = 387.12

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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.