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Finding the Fourth Proportional to 150, 207.12 and 115.68

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Solution

The fourth proportional to 150, 207.12 and 115.68 is: 159.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    150 : 207.12 = 115.68 : x
  2. Step 2: Convert to fraction form
    150/207.12 = 115.68/x
  3. Step 3: Cross multiply
    150x = 207.12 × 115.68
  4. Step 4: Simplify right side
    150x = 23,959.64
  5. Step 5: Solve for x
    x = 23,959.64/150
  6. Step 6: Final answer
    x = 159.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.