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Finding the Fourth Proportional to 763.26, 1,053.42 and 638.73

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Solution

The fourth proportional to 763.26, 1,053.42 and 638.73 is: 881.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.26 : 1,053.42 = 638.73 : x
  2. Step 2: Convert to fraction form
    763.26/1,053.42 = 638.73/x
  3. Step 3: Cross multiply
    763.26x = 1,053.42 × 638.73
  4. Step 4: Simplify right side
    763.26x = 672,850.96
  5. Step 5: Solve for x
    x = 672,850.96/763.26
  6. Step 6: Final answer
    x = 881.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.