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Finding the Fourth Proportional to 121.54, 180.68 and 118.54

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Solution

The fourth proportional to 121.54, 180.68 and 118.54 is: 176.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.54 : 180.68 = 118.54 : x
  2. Step 2: Convert to fraction form
    121.54/180.68 = 118.54/x
  3. Step 3: Cross multiply
    121.54x = 180.68 × 118.54
  4. Step 4: Simplify right side
    121.54x = 21,417.81
  5. Step 5: Solve for x
    x = 21,417.81/121.54
  6. Step 6: Final answer
    x = 176.22

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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.