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Finding the Fourth Proportional to 281.05, 387.78 and 170.49

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Solution

The fourth proportional to 281.05, 387.78 and 170.49 is: 235.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.05 : 387.78 = 170.49 : x
  2. Step 2: Convert to fraction form
    281.05/387.78 = 170.49/x
  3. Step 3: Cross multiply
    281.05x = 387.78 × 170.49
  4. Step 4: Simplify right side
    281.05x = 66,109.82
  5. Step 5: Solve for x
    x = 66,109.82/281.05
  6. Step 6: Final answer
    x = 235.22

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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.