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Finding the Fourth Proportional to 716.85, 1,073.45 and 391.84

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Solution

The fourth proportional to 716.85, 1,073.45 and 391.84 is: 586.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.85 : 1,073.45 = 391.84 : x
  2. Step 2: Convert to fraction form
    716.85/1,073.45 = 391.84/x
  3. Step 3: Cross multiply
    716.85x = 1,073.45 × 391.84
  4. Step 4: Simplify right side
    716.85x = 420,618.94
  5. Step 5: Solve for x
    x = 420,618.94/716.85
  6. Step 6: Final answer
    x = 586.76

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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.