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Finding the Fourth Proportional to 142.97, 214.34 and 121.33

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Solution

The fourth proportional to 142.97, 214.34 and 121.33 is: 181.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.97 : 214.34 = 121.33 : x
  2. Step 2: Convert to fraction form
    142.97/214.34 = 121.33/x
  3. Step 3: Cross multiply
    142.97x = 214.34 × 121.33
  4. Step 4: Simplify right side
    142.97x = 26,005.64
  5. Step 5: Solve for x
    x = 26,005.64/142.97
  6. Step 6: Final answer
    x = 181.89

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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.