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Finding the Fourth Proportional to 720.75, 1,081.50 and 391.92

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Solution

The fourth proportional to 720.75, 1,081.50 and 391.92 is: 588.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.75 : 1,081.50 = 391.92 : x
  2. Step 2: Convert to fraction form
    720.75/1,081.50 = 391.92/x
  3. Step 3: Cross multiply
    720.75x = 1,081.50 × 391.92
  4. Step 4: Simplify right side
    720.75x = 423,864.24
  5. Step 5: Solve for x
    x = 423,864.24/720.75
  6. Step 6: Final answer
    x = 588.09

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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.