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Finding the Fourth Proportional to 721.91, 1,081.45 and 375.47

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Solution

The fourth proportional to 721.91, 1,081.45 and 375.47 is: 562.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.91 : 1,081.45 = 375.47 : x
  2. Step 2: Convert to fraction form
    721.91/1,081.45 = 375.47/x
  3. Step 3: Cross multiply
    721.91x = 1,081.45 × 375.47
  4. Step 4: Simplify right side
    721.91x = 406,050.15
  5. Step 5: Solve for x
    x = 406,050.15/721.91
  6. Step 6: Final answer
    x = 562.47

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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.