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Finding the Fourth Proportional to 119.68, 179.40 and 61.80

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Solution

The fourth proportional to 119.68, 179.40 and 61.80 is: 92.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.68 : 179.40 = 61.80 : x
  2. Step 2: Convert to fraction form
    119.68/179.40 = 61.80/x
  3. Step 3: Cross multiply
    119.68x = 179.40 × 61.80
  4. Step 4: Simplify right side
    119.68x = 11,086.92
  5. Step 5: Solve for x
    x = 11,086.92/119.68
  6. Step 6: Final answer
    x = 92.64

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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.