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Finding the Fourth Proportional to 254.93, 382.39 and 100.80

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Solution

The fourth proportional to 254.93, 382.39 and 100.80 is: 151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.93 : 382.39 = 100.80 : x
  2. Step 2: Convert to fraction form
    254.93/382.39 = 100.80/x
  3. Step 3: Cross multiply
    254.93x = 382.39 × 100.80
  4. Step 4: Simplify right side
    254.93x = 38,544.66
  5. Step 5: Solve for x
    x = 38,544.66/254.93
  6. Step 6: Final answer
    x = 151.20

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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.