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Finding the Fourth Proportional to 229.64, 345.70 and 209.80

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Solution

The fourth proportional to 229.64, 345.70 and 209.80 is: 315.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.64 : 345.70 = 209.80 : x
  2. Step 2: Convert to fraction form
    229.64/345.70 = 209.80/x
  3. Step 3: Cross multiply
    229.64x = 345.70 × 209.80
  4. Step 4: Simplify right side
    229.64x = 72,527.86
  5. Step 5: Solve for x
    x = 72,527.86/229.64
  6. Step 6: Final answer
    x = 315.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.