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Finding the Fourth Proportional to 1,294.22, 1,939.92 and 636.55

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Solution

The fourth proportional to 1,294.22, 1,939.92 and 636.55 is: 954.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.22 : 1,939.92 = 636.55 : x
  2. Step 2: Convert to fraction form
    1,294.22/1,939.92 = 636.55/x
  3. Step 3: Cross multiply
    1,294.22x = 1,939.92 × 636.55
  4. Step 4: Simplify right side
    1,294.22x = 1,234,856.08
  5. Step 5: Solve for x
    x = 1,234,856.08/1,294.22
  6. Step 6: Final answer
    x = 954.13

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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.