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Finding the Fourth Proportional to 119.54, 179.21 and 70.81

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Solution

The fourth proportional to 119.54, 179.21 and 70.81 is: 106.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.54 : 179.21 = 70.81 : x
  2. Step 2: Convert to fraction form
    119.54/179.21 = 70.81/x
  3. Step 3: Cross multiply
    119.54x = 179.21 × 70.81
  4. Step 4: Simplify right side
    119.54x = 12,689.59
  5. Step 5: Solve for x
    x = 12,689.59/119.54
  6. Step 6: Final answer
    x = 106.15

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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.