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Finding the Fourth Proportional to 165.71, 248.18 and 142.31

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Solution

The fourth proportional to 165.71, 248.18 and 142.31 is: 213.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.71 : 248.18 = 142.31 : x
  2. Step 2: Convert to fraction form
    165.71/248.18 = 142.31/x
  3. Step 3: Cross multiply
    165.71x = 248.18 × 142.31
  4. Step 4: Simplify right side
    165.71x = 35,317.61
  5. Step 5: Solve for x
    x = 35,317.61/165.71
  6. Step 6: Final answer
    x = 213.14

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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.