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Finding the Fourth Proportional to 281.24, 387.78 and 256.58

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Solution

The fourth proportional to 281.24, 387.78 and 256.58 is: 353.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.24 : 387.78 = 256.58 : x
  2. Step 2: Convert to fraction form
    281.24/387.78 = 256.58/x
  3. Step 3: Cross multiply
    281.24x = 387.78 × 256.58
  4. Step 4: Simplify right side
    281.24x = 99,496.59
  5. Step 5: Solve for x
    x = 99,496.59/281.24
  6. Step 6: Final answer
    x = 353.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.