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Finding the Fourth Proportional to 255.66, 385.09 and 240.28

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Solution

The fourth proportional to 255.66, 385.09 and 240.28 is: 361.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.66 : 385.09 = 240.28 : x
  2. Step 2: Convert to fraction form
    255.66/385.09 = 240.28/x
  3. Step 3: Cross multiply
    255.66x = 385.09 × 240.28
  4. Step 4: Simplify right side
    255.66x = 92,529.43
  5. Step 5: Solve for x
    x = 92,529.43/255.66
  6. Step 6: Final answer
    x = 361.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.