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Finding the Fourth Proportional to 720.17, 1,082.19 and 391.35

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Solution

The fourth proportional to 720.17, 1,082.19 and 391.35 is: 588.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.17 : 1,082.19 = 391.35 : x
  2. Step 2: Convert to fraction form
    720.17/1,082.19 = 391.35/x
  3. Step 3: Cross multiply
    720.17x = 1,082.19 × 391.35
  4. Step 4: Simplify right side
    720.17x = 423,520.61
  5. Step 5: Solve for x
    x = 423,520.61/720.17
  6. Step 6: Final answer
    x = 588.08

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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.