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Finding the Fourth Proportional to 121.28, 167.40 and 77.63

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Solution

The fourth proportional to 121.28, 167.40 and 77.63 is: 107.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.28 : 167.40 = 77.63 : x
  2. Step 2: Convert to fraction form
    121.28/167.40 = 77.63/x
  3. Step 3: Cross multiply
    121.28x = 167.40 × 77.63
  4. Step 4: Simplify right side
    121.28x = 12,994.43
  5. Step 5: Solve for x
    x = 12,994.43/121.28
  6. Step 6: Final answer
    x = 107.15

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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.