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Finding the Fourth Proportional to 166.48, 229.60 and 122.72

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Solution

The fourth proportional to 166.48, 229.60 and 122.72 is: 169.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.48 : 229.60 = 122.72 : x
  2. Step 2: Convert to fraction form
    166.48/229.60 = 122.72/x
  3. Step 3: Cross multiply
    166.48x = 229.60 × 122.72
  4. Step 4: Simplify right side
    166.48x = 28,176.51
  5. Step 5: Solve for x
    x = 28,176.51/166.48
  6. Step 6: Final answer
    x = 169.25

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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.