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Finding the Fourth Proportional to 720.45, 1,081.00 and 281.84

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Solution

The fourth proportional to 720.45, 1,081.00 and 281.84 is: 422.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.45 : 1,081.00 = 281.84 : x
  2. Step 2: Convert to fraction form
    720.45/1,081.00 = 281.84/x
  3. Step 3: Cross multiply
    720.45x = 1,081.00 × 281.84
  4. Step 4: Simplify right side
    720.45x = 304,665.44
  5. Step 5: Solve for x
    x = 304,665.44/720.45
  6. Step 6: Final answer
    x = 422.88

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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.