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Finding the Fourth Proportional to 207.78, 311.24 and 159.12

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Solution

The fourth proportional to 207.78, 311.24 and 159.12 is: 238.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.78 : 311.24 = 159.12 : x
  2. Step 2: Convert to fraction form
    207.78/311.24 = 159.12/x
  3. Step 3: Cross multiply
    207.78x = 311.24 × 159.12
  4. Step 4: Simplify right side
    207.78x = 49,524.51
  5. Step 5: Solve for x
    x = 49,524.51/207.78
  6. Step 6: Final answer
    x = 238.35

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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.