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Finding the Fourth Proportional to 119.90, 179.86 and 55.76

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Solution

The fourth proportional to 119.90, 179.86 and 55.76 is: 83.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.90 : 179.86 = 55.76 : x
  2. Step 2: Convert to fraction form
    119.90/179.86 = 55.76/x
  3. Step 3: Cross multiply
    119.90x = 179.86 × 55.76
  4. Step 4: Simplify right side
    119.90x = 10,028.99
  5. Step 5: Solve for x
    x = 10,028.99/119.90
  6. Step 6: Final answer
    x = 83.64

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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.