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Finding the Fourth Proportional to 281.11, 387.90 and 156.76

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Solution

The fourth proportional to 281.11, 387.90 and 156.76 is: 216.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.11 : 387.90 = 156.76 : x
  2. Step 2: Convert to fraction form
    281.11/387.90 = 156.76/x
  3. Step 3: Cross multiply
    281.11x = 387.90 × 156.76
  4. Step 4: Simplify right side
    281.11x = 60,805.45
  5. Step 5: Solve for x
    x = 60,805.45/281.11
  6. Step 6: Final answer
    x = 216.30

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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.