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Finding the Fourth Proportional to 165.18, 247.86 and 141.42

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Solution

The fourth proportional to 165.18, 247.86 and 141.42 is: 212.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.18 : 247.86 = 141.42 : x
  2. Step 2: Convert to fraction form
    165.18/247.86 = 141.42/x
  3. Step 3: Cross multiply
    165.18x = 247.86 × 141.42
  4. Step 4: Simplify right side
    165.18x = 35,052.36
  5. Step 5: Solve for x
    x = 35,052.36/165.18
  6. Step 6: Final answer
    x = 212.21

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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.