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Finding the Fourth Proportional to 220.76, 304.65 and 121.18

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Solution

The fourth proportional to 220.76, 304.65 and 121.18 is: 167.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.76 : 304.65 = 121.18 : x
  2. Step 2: Convert to fraction form
    220.76/304.65 = 121.18/x
  3. Step 3: Cross multiply
    220.76x = 304.65 × 121.18
  4. Step 4: Simplify right side
    220.76x = 36,918.84
  5. Step 5: Solve for x
    x = 36,918.84/220.76
  6. Step 6: Final answer
    x = 167.24

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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.