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Finding the Fourth Proportional to 121.84, 168.06 and 87.28

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Solution

The fourth proportional to 121.84, 168.06 and 87.28 is: 120.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.84 : 168.06 = 87.28 : x
  2. Step 2: Convert to fraction form
    121.84/168.06 = 87.28/x
  3. Step 3: Cross multiply
    121.84x = 168.06 × 87.28
  4. Step 4: Simplify right side
    121.84x = 14,668.28
  5. Step 5: Solve for x
    x = 14,668.28/121.84
  6. Step 6: Final answer
    x = 120.39

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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.