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Finding the Fourth Proportional to 119.68, 180.12 and 89.40

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Solution

The fourth proportional to 119.68, 180.12 and 89.40 is: 134.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.68 : 180.12 = 89.40 : x
  2. Step 2: Convert to fraction form
    119.68/180.12 = 89.40/x
  3. Step 3: Cross multiply
    119.68x = 180.12 × 89.40
  4. Step 4: Simplify right side
    119.68x = 16,103.74
  5. Step 5: Solve for x
    x = 16,103.74/119.68
  6. Step 6: Final answer
    x = 134.56

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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.