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Finding the Fourth Proportional to 167.48, 251.30 and 128.90

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Solution

The fourth proportional to 167.48, 251.30 and 128.90 is: 193.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.48 : 251.30 = 128.90 : x
  2. Step 2: Convert to fraction form
    167.48/251.30 = 128.90/x
  3. Step 3: Cross multiply
    167.48x = 251.30 × 128.90
  4. Step 4: Simplify right side
    167.48x = 32,391.93
  5. Step 5: Solve for x
    x = 32,391.93/167.48
  6. Step 6: Final answer
    x = 193.41

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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.