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Finding the Fourth Proportional to 720.96, 1,081.68 and 396.15

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Solution

The fourth proportional to 720.96, 1,081.68 and 396.15 is: 594.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.96 : 1,081.68 = 396.15 : x
  2. Step 2: Convert to fraction form
    720.96/1,081.68 = 396.15/x
  3. Step 3: Cross multiply
    720.96x = 1,081.68 × 396.15
  4. Step 4: Simplify right side
    720.96x = 428,507.53
  5. Step 5: Solve for x
    x = 428,507.53/720.96
  6. Step 6: Final answer
    x = 594.36

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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.