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Finding the Fourth Proportional to 167.70, 231.20 and 139.58

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Solution

The fourth proportional to 167.70, 231.20 and 139.58 is: 192.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.70 : 231.20 = 139.58 : x
  2. Step 2: Convert to fraction form
    167.70/231.20 = 139.58/x
  3. Step 3: Cross multiply
    167.70x = 231.20 × 139.58
  4. Step 4: Simplify right side
    167.70x = 32,270.90
  5. Step 5: Solve for x
    x = 32,270.90/167.70
  6. Step 6: Final answer
    x = 192.43

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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.