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Finding the Fourth Proportional to 165.42, 248.20 and 143.78

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Solution

The fourth proportional to 165.42, 248.20 and 143.78 is: 215.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.42 : 248.20 = 143.78 : x
  2. Step 2: Convert to fraction form
    165.42/248.20 = 143.78/x
  3. Step 3: Cross multiply
    165.42x = 248.20 × 143.78
  4. Step 4: Simplify right side
    165.42x = 35,684.60
  5. Step 5: Solve for x
    x = 35,684.60/165.42
  6. Step 6: Final answer
    x = 215.72

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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.