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Finding the Fourth Proportional to 720.16, 1,082.18 and 391.32

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Solution

The fourth proportional to 720.16, 1,082.18 and 391.32 is: 588.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.16 : 1,082.18 = 391.32 : x
  2. Step 2: Convert to fraction form
    720.16/1,082.18 = 391.32/x
  3. Step 3: Cross multiply
    720.16x = 1,082.18 × 391.32
  4. Step 4: Simplify right side
    720.16x = 423,478.68
  5. Step 5: Solve for x
    x = 423,478.68/720.16
  6. Step 6: Final answer
    x = 588.03

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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.