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Finding the Fourth Proportional to 454.38, 681.55 and 129.74

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Solution

The fourth proportional to 454.38, 681.55 and 129.74 is: 194.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.38 : 681.55 = 129.74 : x
  2. Step 2: Convert to fraction form
    454.38/681.55 = 129.74/x
  3. Step 3: Cross multiply
    454.38x = 681.55 × 129.74
  4. Step 4: Simplify right side
    454.38x = 88,420.56
  5. Step 5: Solve for x
    x = 88,420.56/454.38
  6. Step 6: Final answer
    x = 194.60

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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.