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Finding the Fourth Proportional to 229.88, 318.98 and 220.74

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Solution

The fourth proportional to 229.88, 318.98 and 220.74 is: 306.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.88 : 318.98 = 220.74 : x
  2. Step 2: Convert to fraction form
    229.88/318.98 = 220.74/x
  3. Step 3: Cross multiply
    229.88x = 318.98 × 220.74
  4. Step 4: Simplify right side
    229.88x = 70,411.65
  5. Step 5: Solve for x
    x = 70,411.65/229.88
  6. Step 6: Final answer
    x = 306.30

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.