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Finding the Fourth Proportional to 167.99, 231.70 and 121.51

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Solution

The fourth proportional to 167.99, 231.70 and 121.51 is: 167.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.99 : 231.70 = 121.51 : x
  2. Step 2: Convert to fraction form
    167.99/231.70 = 121.51/x
  3. Step 3: Cross multiply
    167.99x = 231.70 × 121.51
  4. Step 4: Simplify right side
    167.99x = 28,153.87
  5. Step 5: Solve for x
    x = 28,153.87/167.99
  6. Step 6: Final answer
    x = 167.59

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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.