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Finding the Fourth Proportional to 119.71, 179.48 and 51.21

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Solution

The fourth proportional to 119.71, 179.48 and 51.21 is: 76.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.71 : 179.48 = 51.21 : x
  2. Step 2: Convert to fraction form
    119.71/179.48 = 51.21/x
  3. Step 3: Cross multiply
    119.71x = 179.48 × 51.21
  4. Step 4: Simplify right side
    119.71x = 9,191.11
  5. Step 5: Solve for x
    x = 9,191.11/119.71
  6. Step 6: Final answer
    x = 76.78

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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.