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Finding the Fourth Proportional to 144.18, 215.40 and 108.12

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Solution

The fourth proportional to 144.18, 215.40 and 108.12 is: 161.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.18 : 215.40 = 108.12 : x
  2. Step 2: Convert to fraction form
    144.18/215.40 = 108.12/x
  3. Step 3: Cross multiply
    144.18x = 215.40 × 108.12
  4. Step 4: Simplify right side
    144.18x = 23,289.05
  5. Step 5: Solve for x
    x = 23,289.05/144.18
  6. Step 6: Final answer
    x = 161.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.