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Finding the Fourth Proportional to 938.61, 1,407.96 and 451.44

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Solution

The fourth proportional to 938.61, 1,407.96 and 451.44 is: 677.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.61 : 1,407.96 = 451.44 : x
  2. Step 2: Convert to fraction form
    938.61/1,407.96 = 451.44/x
  3. Step 3: Cross multiply
    938.61x = 1,407.96 × 451.44
  4. Step 4: Simplify right side
    938.61x = 635,609.46
  5. Step 5: Solve for x
    x = 635,609.46/938.61
  6. Step 6: Final answer
    x = 677.18

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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.