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Finding the Fourth Proportional to 179.61, 247.57 and 142.71

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Solution

The fourth proportional to 179.61, 247.57 and 142.71 is: 196.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.61 : 247.57 = 142.71 : x
  2. Step 2: Convert to fraction form
    179.61/247.57 = 142.71/x
  3. Step 3: Cross multiply
    179.61x = 247.57 × 142.71
  4. Step 4: Simplify right side
    179.61x = 35,330.71
  5. Step 5: Solve for x
    x = 35,330.71/179.61
  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.