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Finding the Fourth Proportional to 121.51, 167.50 and 99.34

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Solution

The fourth proportional to 121.51, 167.50 and 99.34 is: 136.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.51 : 167.50 = 99.34 : x
  2. Step 2: Convert to fraction form
    121.51/167.50 = 99.34/x
  3. Step 3: Cross multiply
    121.51x = 167.50 × 99.34
  4. Step 4: Simplify right side
    121.51x = 16,639.45
  5. Step 5: Solve for x
    x = 16,639.45/121.51
  6. Step 6: Final answer
    x = 136.94

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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.