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Finding the Fourth Proportional to 261.56, 391.73 and 163.76

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Solution

The fourth proportional to 261.56, 391.73 and 163.76 is: 245.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.56 : 391.73 = 163.76 : x
  2. Step 2: Convert to fraction form
    261.56/391.73 = 163.76/x
  3. Step 3: Cross multiply
    261.56x = 391.73 × 163.76
  4. Step 4: Simplify right side
    261.56x = 64,146.93
  5. Step 5: Solve for x
    x = 64,146.93/261.56
  6. Step 6: Final answer
    x = 245.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.