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Finding the Fourth Proportional to 716.10, 1,074.14 and 391.29

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Solution

The fourth proportional to 716.10, 1,074.14 and 391.29 is: 586.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.10 : 1,074.14 = 391.29 : x
  2. Step 2: Convert to fraction form
    716.10/1,074.14 = 391.29/x
  3. Step 3: Cross multiply
    716.10x = 1,074.14 × 391.29
  4. Step 4: Simplify right side
    716.10x = 420,300.24
  5. Step 5: Solve for x
    x = 420,300.24/716.10
  6. Step 6: Final answer
    x = 586.93

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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.