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Finding the Fourth Proportional to 142.25, 212.34 and 121.59

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Solution

The fourth proportional to 142.25, 212.34 and 121.59 is: 181.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.25 : 212.34 = 121.59 : x
  2. Step 2: Convert to fraction form
    142.25/212.34 = 121.59/x
  3. Step 3: Cross multiply
    142.25x = 212.34 × 121.59
  4. Step 4: Simplify right side
    142.25x = 25,818.42
  5. Step 5: Solve for x
    x = 25,818.42/142.25
  6. Step 6: Final answer
    x = 181.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.