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Finding the Fourth Proportional to 219.68, 303.15 and 121.42

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Solution

The fourth proportional to 219.68, 303.15 and 121.42 is: 167.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.68 : 303.15 = 121.42 : x
  2. Step 2: Convert to fraction form
    219.68/303.15 = 121.42/x
  3. Step 3: Cross multiply
    219.68x = 303.15 × 121.42
  4. Step 4: Simplify right side
    219.68x = 36,808.47
  5. Step 5: Solve for x
    x = 36,808.47/219.68
  6. Step 6: Final answer
    x = 167.55

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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.