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Finding the Fourth Proportional to 720.96, 1,081.72 and 288.24

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Solution

The fourth proportional to 720.96, 1,081.72 and 288.24 is: 432.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.96 : 1,081.72 = 288.24 : x
  2. Step 2: Convert to fraction form
    720.96/1,081.72 = 288.24/x
  3. Step 3: Cross multiply
    720.96x = 1,081.72 × 288.24
  4. Step 4: Simplify right side
    720.96x = 311,794.97
  5. Step 5: Solve for x
    x = 311,794.97/720.96
  6. Step 6: Final answer
    x = 432.47

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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.