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Finding the Fourth Proportional to 119.84, 179.88 and 85.52

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Solution

The fourth proportional to 119.84, 179.88 and 85.52 is: 128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.84 : 179.88 = 85.52 : x
  2. Step 2: Convert to fraction form
    119.84/179.88 = 85.52/x
  3. Step 3: Cross multiply
    119.84x = 179.88 × 85.52
  4. Step 4: Simplify right side
    119.84x = 15,383.34
  5. Step 5: Solve for x
    x = 15,383.34/119.84
  6. Step 6: Final answer
    x = 128.37

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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.