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Finding the Fourth Proportional to 672.22, 1,001.28 and 663.82

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Solution

The fourth proportional to 672.22, 1,001.28 and 663.82 is: 988.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.22 : 1,001.28 = 663.82 : x
  2. Step 2: Convert to fraction form
    672.22/1,001.28 = 663.82/x
  3. Step 3: Cross multiply
    672.22x = 1,001.28 × 663.82
  4. Step 4: Simplify right side
    672.22x = 664,669.69
  5. Step 5: Solve for x
    x = 664,669.69/672.22
  6. Step 6: Final answer
    x = 988.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.