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Finding the Fourth Proportional to 716.62, 1,074.10 and 392.20

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Solution

The fourth proportional to 716.62, 1,074.10 and 392.20 is: 587.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.62 : 1,074.10 = 392.20 : x
  2. Step 2: Convert to fraction form
    716.62/1,074.10 = 392.20/x
  3. Step 3: Cross multiply
    716.62x = 1,074.10 × 392.20
  4. Step 4: Simplify right side
    716.62x = 421,262.02
  5. Step 5: Solve for x
    x = 421,262.02/716.62
  6. Step 6: Final answer
    x = 587.85

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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.