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Finding the Fourth Proportional to 219.80, 303.31 and 121.57

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Solution

The fourth proportional to 219.80, 303.31 and 121.57 is: 167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.80 : 303.31 = 121.57 : x
  2. Step 2: Convert to fraction form
    219.80/303.31 = 121.57/x
  3. Step 3: Cross multiply
    219.80x = 303.31 × 121.57
  4. Step 4: Simplify right side
    219.80x = 36,873.40
  5. Step 5: Solve for x
    x = 36,873.40/219.80
  6. Step 6: Final answer
    x = 167.76

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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.