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Finding the Fourth Proportional to 167.32, 251 and 128.86

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Solution

The fourth proportional to 167.32, 251 and 128.86 is: 193.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.32 : 251 = 128.86 : x
  2. Step 2: Convert to fraction form
    167.32/251 = 128.86/x
  3. Step 3: Cross multiply
    167.32x = 251 × 128.86
  4. Step 4: Simplify right side
    167.32x = 32,343.86
  5. Step 5: Solve for x
    x = 32,343.86/167.32
  6. Step 6: Final answer
    x = 193.31

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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.