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Finding the Fourth Proportional to 142.74, 212.85 and 131.52

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Solution

The fourth proportional to 142.74, 212.85 and 131.52 is: 196.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.74 : 212.85 = 131.52 : x
  2. Step 2: Convert to fraction form
    142.74/212.85 = 131.52/x
  3. Step 3: Cross multiply
    142.74x = 212.85 × 131.52
  4. Step 4: Simplify right side
    142.74x = 27,992.31
  5. Step 5: Solve for x
    x = 27,992.31/142.74
  6. Step 6: Final answer
    x = 196.11

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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.