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Finding the Fourth Proportional to 219.55, 302.98 and 121.31

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Solution

The fourth proportional to 219.55, 302.98 and 121.31 is: 167.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.55 : 302.98 = 121.31 : x
  2. Step 2: Convert to fraction form
    219.55/302.98 = 121.31/x
  3. Step 3: Cross multiply
    219.55x = 302.98 × 121.31
  4. Step 4: Simplify right side
    219.55x = 36,753.75
  5. Step 5: Solve for x
    x = 36,753.75/219.55
  6. Step 6: Final answer
    x = 167.40

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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.