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Finding the Fourth Proportional to 454.51, 681.77 and 129.90

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Solution

The fourth proportional to 454.51, 681.77 and 129.90 is: 194.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.51 : 681.77 = 129.90 : x
  2. Step 2: Convert to fraction form
    454.51/681.77 = 129.90/x
  3. Step 3: Cross multiply
    454.51x = 681.77 × 129.90
  4. Step 4: Simplify right side
    454.51x = 88,562.25
  5. Step 5: Solve for x
    x = 88,562.25/454.51
  6. Step 6: Final answer
    x = 194.85

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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.