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Finding the Fourth Proportional to 119.18, 178.58 and 80.65

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Solution

The fourth proportional to 119.18, 178.58 and 80.65 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.18 : 178.58 = 80.65 : x
  2. Step 2: Convert to fraction form
    119.18/178.58 = 80.65/x
  3. Step 3: Cross multiply
    119.18x = 178.58 × 80.65
  4. Step 4: Simplify right side
    119.18x = 14,402.48
  5. Step 5: Solve for x
    x = 14,402.48/119.18
  6. Step 6: Final answer
    x = 120.85

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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.