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Finding the Fourth Proportional to 708.42, 1,062.31 and 379.30

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Solution

The fourth proportional to 708.42, 1,062.31 and 379.30 is: 568.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.42 : 1,062.31 = 379.30 : x
  2. Step 2: Convert to fraction form
    708.42/1,062.31 = 379.30/x
  3. Step 3: Cross multiply
    708.42x = 1,062.31 × 379.30
  4. Step 4: Simplify right side
    708.42x = 402,933.28
  5. Step 5: Solve for x
    x = 402,933.28/708.42
  6. Step 6: Final answer
    x = 568.78

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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.