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Finding the Fourth Proportional to 186.87, 257.90 and 142.53

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Solution

The fourth proportional to 186.87, 257.90 and 142.53 is: 196.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.87 : 257.90 = 142.53 : x
  2. Step 2: Convert to fraction form
    186.87/257.90 = 142.53/x
  3. Step 3: Cross multiply
    186.87x = 257.90 × 142.53
  4. Step 4: Simplify right side
    186.87x = 36,758.49
  5. Step 5: Solve for x
    x = 36,758.49/186.87
  6. Step 6: Final answer
    x = 196.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.