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Finding the Fourth Proportional to 591.27, 815.99 and 391.75

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Solution

The fourth proportional to 591.27, 815.99 and 391.75 is: 540.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.27 : 815.99 = 391.75 : x
  2. Step 2: Convert to fraction form
    591.27/815.99 = 391.75/x
  3. Step 3: Cross multiply
    591.27x = 815.99 × 391.75
  4. Step 4: Simplify right side
    591.27x = 319,664.08
  5. Step 5: Solve for x
    x = 319,664.08/591.27
  6. Step 6: Final answer
    x = 540.64

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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.