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Finding the Fourth Proportional to 591.01, 815.71 and 391.85

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Solution

The fourth proportional to 591.01, 815.71 and 391.85 is: 540.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.01 : 815.71 = 391.85 : x
  2. Step 2: Convert to fraction form
    591.01/815.71 = 391.85/x
  3. Step 3: Cross multiply
    591.01x = 815.71 × 391.85
  4. Step 4: Simplify right side
    591.01x = 319,634.70
  5. Step 5: Solve for x
    x = 319,634.70/591.01
  6. Step 6: Final answer
    x = 540.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.