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Finding the Fourth Proportional to 672.11, 1,007.66 and 281.79

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Solution

The fourth proportional to 672.11, 1,007.66 and 281.79 is: 422.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.11 : 1,007.66 = 281.79 : x
  2. Step 2: Convert to fraction form
    672.11/1,007.66 = 281.79/x
  3. Step 3: Cross multiply
    672.11x = 1,007.66 × 281.79
  4. Step 4: Simplify right side
    672.11x = 283,947.10
  5. Step 5: Solve for x
    x = 283,947.10/672.11
  6. Step 6: Final answer
    x = 422.47

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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.