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Finding the Fourth Proportional to 254.18, 350.78 and 143.66

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Solution

The fourth proportional to 254.18, 350.78 and 143.66 is: 198.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.18 : 350.78 = 143.66 : x
  2. Step 2: Convert to fraction form
    254.18/350.78 = 143.66/x
  3. Step 3: Cross multiply
    254.18x = 350.78 × 143.66
  4. Step 4: Simplify right side
    254.18x = 50,390.58
  5. Step 5: Solve for x
    x = 50,390.58/254.18
  6. Step 6: Final answer
    x = 198.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.