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Finding the Fourth Proportional to 220.74, 329.28 and 186.72

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Solution

The fourth proportional to 220.74, 329.28 and 186.72 is: 278.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.74 : 329.28 = 186.72 : x
  2. Step 2: Convert to fraction form
    220.74/329.28 = 186.72/x
  3. Step 3: Cross multiply
    220.74x = 329.28 × 186.72
  4. Step 4: Simplify right side
    220.74x = 61,483.16
  5. Step 5: Solve for x
    x = 61,483.16/220.74
  6. Step 6: Final answer
    x = 278.53

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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.