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Finding the Fourth Proportional to 261.24, 391.70 and 116.92

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Solution

The fourth proportional to 261.24, 391.70 and 116.92 is: 175.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.24 : 391.70 = 116.92 : x
  2. Step 2: Convert to fraction form
    261.24/391.70 = 116.92/x
  3. Step 3: Cross multiply
    261.24x = 391.70 × 116.92
  4. Step 4: Simplify right side
    261.24x = 45,797.56
  5. Step 5: Solve for x
    x = 45,797.56/261.24
  6. Step 6: Final answer
    x = 175.31

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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.