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Finding the Fourth Proportional to 961.18, 1,442.13 and 447.82

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Solution

The fourth proportional to 961.18, 1,442.13 and 447.82 is: 671.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.18 : 1,442.13 = 447.82 : x
  2. Step 2: Convert to fraction form
    961.18/1,442.13 = 447.82/x
  3. Step 3: Cross multiply
    961.18x = 1,442.13 × 447.82
  4. Step 4: Simplify right side
    961.18x = 645,814.66
  5. Step 5: Solve for x
    x = 645,814.66/961.18
  6. Step 6: Final answer
    x = 671.90

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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.