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Finding the Fourth Proportional to 144.42, 216.36 and 138.75

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Solution

The fourth proportional to 144.42, 216.36 and 138.75 is: 207.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.42 : 216.36 = 138.75 : x
  2. Step 2: Convert to fraction form
    144.42/216.36 = 138.75/x
  3. Step 3: Cross multiply
    144.42x = 216.36 × 138.75
  4. Step 4: Simplify right side
    144.42x = 30,019.95
  5. Step 5: Solve for x
    x = 30,019.95/144.42
  6. Step 6: Final answer
    x = 207.87

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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.