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Finding the Fourth Proportional to 440.13, 660.10 and 391.28

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Solution

The fourth proportional to 440.13, 660.10 and 391.28 is: 586.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.13 : 660.10 = 391.28 : x
  2. Step 2: Convert to fraction form
    440.13/660.10 = 391.28/x
  3. Step 3: Cross multiply
    440.13x = 660.10 × 391.28
  4. Step 4: Simplify right side
    440.13x = 258,284.10
  5. Step 5: Solve for x
    x = 258,284.10/440.13
  6. Step 6: Final answer
    x = 586.83

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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.