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Finding the Fourth Proportional to 261.96, 391.08 and 229.56

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Solution

The fourth proportional to 261.96, 391.08 and 229.56 is: 342.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.96 : 391.08 = 229.56 : x
  2. Step 2: Convert to fraction form
    261.96/391.08 = 229.56/x
  3. Step 3: Cross multiply
    261.96x = 391.08 × 229.56
  4. Step 4: Simplify right side
    261.96x = 89,776.32
  5. Step 5: Solve for x
    x = 89,776.32/261.96
  6. Step 6: Final answer
    x = 342.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.