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Finding the Fourth Proportional to 523.18, 721.40 and 391.96

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Solution

The fourth proportional to 523.18, 721.40 and 391.96 is: 540.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.18 : 721.40 = 391.96 : x
  2. Step 2: Convert to fraction form
    523.18/721.40 = 391.96/x
  3. Step 3: Cross multiply
    523.18x = 721.40 × 391.96
  4. Step 4: Simplify right side
    523.18x = 282,759.94
  5. Step 5: Solve for x
    x = 282,759.94/523.18
  6. Step 6: Final answer
    x = 540.46

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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.