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Finding the Fourth Proportional to 311.96, 430.34 and 187.60

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Solution

The fourth proportional to 311.96, 430.34 and 187.60 is: 258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.96 : 430.34 = 187.60 : x
  2. Step 2: Convert to fraction form
    311.96/430.34 = 187.60/x
  3. Step 3: Cross multiply
    311.96x = 430.34 × 187.60
  4. Step 4: Simplify right side
    311.96x = 80,731.18
  5. Step 5: Solve for x
    x = 80,731.18/311.96
  6. Step 6: Final answer
    x = 258.78

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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.