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Finding the Fourth Proportional to 454.42, 681.76 and 129.80

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Solution

The fourth proportional to 454.42, 681.76 and 129.80 is: 194.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.42 : 681.76 = 129.80 : x
  2. Step 2: Convert to fraction form
    454.42/681.76 = 129.80/x
  3. Step 3: Cross multiply
    454.42x = 681.76 × 129.80
  4. Step 4: Simplify right side
    454.42x = 88,492.45
  5. Step 5: Solve for x
    x = 88,492.45/454.42
  6. Step 6: Final answer
    x = 194.74

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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.