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Finding the Fourth Proportional to 585.50, 879.10 and 391.71

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Solution

The fourth proportional to 585.50, 879.10 and 391.71 is: 588.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.50 : 879.10 = 391.71 : x
  2. Step 2: Convert to fraction form
    585.50/879.10 = 391.71/x
  3. Step 3: Cross multiply
    585.50x = 879.10 × 391.71
  4. Step 4: Simplify right side
    585.50x = 344,351.28
  5. Step 5: Solve for x
    x = 344,351.28/585.50
  6. Step 6: Final answer
    x = 588.13

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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.