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Finding the Fourth Proportional to 440.22, 660.96 and 391.62

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Solution

The fourth proportional to 440.22, 660.96 and 391.62 is: 587.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.22 : 660.96 = 391.62 : x
  2. Step 2: Convert to fraction form
    440.22/660.96 = 391.62/x
  3. Step 3: Cross multiply
    440.22x = 660.96 × 391.62
  4. Step 4: Simplify right side
    440.22x = 258,845.16
  5. Step 5: Solve for x
    x = 258,845.16/440.22
  6. Step 6: Final answer
    x = 587.99

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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.