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Finding the Fourth Proportional to 119.92, 179.72 and 47.76

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Solution

The fourth proportional to 119.92, 179.72 and 47.76 is: 71.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.92 : 179.72 = 47.76 : x
  2. Step 2: Convert to fraction form
    119.92/179.72 = 47.76/x
  3. Step 3: Cross multiply
    119.92x = 179.72 × 47.76
  4. Step 4: Simplify right side
    119.92x = 8,583.43
  5. Step 5: Solve for x
    x = 8,583.43/119.92
  6. Step 6: Final answer
    x = 71.58

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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.