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Finding the Fourth Proportional to 275.76, 411.66 and 255.76

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Solution

The fourth proportional to 275.76, 411.66 and 255.76 is: 381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.76 : 411.66 = 255.76 : x
  2. Step 2: Convert to fraction form
    275.76/411.66 = 255.76/x
  3. Step 3: Cross multiply
    275.76x = 411.66 × 255.76
  4. Step 4: Simplify right side
    275.76x = 105,286.16
  5. Step 5: Solve for x
    x = 105,286.16/275.76
  6. Step 6: Final answer
    x = 381.80

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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.