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Finding the Fourth Proportional to 261.27, 389.85 and 255.09

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Solution

The fourth proportional to 261.27, 389.85 and 255.09 is: 380.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.27 : 389.85 = 255.09 : x
  2. Step 2: Convert to fraction form
    261.27/389.85 = 255.09/x
  3. Step 3: Cross multiply
    261.27x = 389.85 × 255.09
  4. Step 4: Simplify right side
    261.27x = 99,446.84
  5. Step 5: Solve for x
    x = 99,446.84/261.27
  6. Step 6: Final answer
    x = 380.64

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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.