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Finding the Fourth Proportional to 281.12, 385.70 and 256.44

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Solution

The fourth proportional to 281.12, 385.70 and 256.44 is: 351.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.12 : 385.70 = 256.44 : x
  2. Step 2: Convert to fraction form
    281.12/385.70 = 256.44/x
  3. Step 3: Cross multiply
    281.12x = 385.70 × 256.44
  4. Step 4: Simplify right side
    281.12x = 98,908.91
  5. Step 5: Solve for x
    x = 98,908.91/281.12
  6. Step 6: Final answer
    x = 351.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.