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Finding the Fourth Proportional to 176.80, 243.80 and 121.45

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Solution

The fourth proportional to 176.80, 243.80 and 121.45 is: 167.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    176.80 : 243.80 = 121.45 : x
  2. Step 2: Convert to fraction form
    176.80/243.80 = 121.45/x
  3. Step 3: Cross multiply
    176.80x = 243.80 × 121.45
  4. Step 4: Simplify right side
    176.80x = 29,609.51
  5. Step 5: Solve for x
    x = 29,609.51/176.80
  6. Step 6: Final answer
    x = 167.47

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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.