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Finding the Fourth Proportional to 454.41, 681.75 and 129.78

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Solution

The fourth proportional to 454.41, 681.75 and 129.78 is: 194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.41 : 681.75 = 129.78 : x
  2. Step 2: Convert to fraction form
    454.41/681.75 = 129.78/x
  3. Step 3: Cross multiply
    454.41x = 681.75 × 129.78
  4. Step 4: Simplify right side
    454.41x = 88,477.52
  5. Step 5: Solve for x
    x = 88,477.52/454.41
  6. Step 6: Final answer
    x = 194.71

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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.