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Finding the Fourth Proportional to 121.44, 167.88 and 113.28

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Solution

The fourth proportional to 121.44, 167.88 and 113.28 is: 156.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.44 : 167.88 = 113.28 : x
  2. Step 2: Convert to fraction form
    121.44/167.88 = 113.28/x
  3. Step 3: Cross multiply
    121.44x = 167.88 × 113.28
  4. Step 4: Simplify right side
    121.44x = 19,017.45
  5. Step 5: Solve for x
    x = 19,017.45/121.44
  6. Step 6: Final answer
    x = 156.60

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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.