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Finding the Fourth Proportional to 121.20, 180.54 and 117.77

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Solution

The fourth proportional to 121.20, 180.54 and 117.77 is: 175.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.20 : 180.54 = 117.77 : x
  2. Step 2: Convert to fraction form
    121.20/180.54 = 117.77/x
  3. Step 3: Cross multiply
    121.20x = 180.54 × 117.77
  4. Step 4: Simplify right side
    121.20x = 21,261.29
  5. Step 5: Solve for x
    x = 21,261.29/121.20
  6. Step 6: Final answer
    x = 175.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.