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Finding the Fourth Proportional to 119.41, 179.74 and 85.40

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Solution

The fourth proportional to 119.41, 179.74 and 85.40 is: 128.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.41 : 179.74 = 85.40 : x
  2. Step 2: Convert to fraction form
    119.41/179.74 = 85.40/x
  3. Step 3: Cross multiply
    119.41x = 179.74 × 85.40
  4. Step 4: Simplify right side
    119.41x = 15,350.21
  5. Step 5: Solve for x
    x = 15,350.21/119.41
  6. Step 6: Final answer
    x = 128.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.