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Finding the Fourth Proportional to 147.15, 220.12 and 119.81

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Solution

The fourth proportional to 147.15, 220.12 and 119.81 is: 179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.15 : 220.12 = 119.81 : x
  2. Step 2: Convert to fraction form
    147.15/220.12 = 119.81/x
  3. Step 3: Cross multiply
    147.15x = 220.12 × 119.81
  4. Step 4: Simplify right side
    147.15x = 26,372.83
  5. Step 5: Solve for x
    x = 26,372.83/147.15
  6. Step 6: Final answer
    x = 179.22

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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.