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Finding the Fourth Proportional to 281.06, 387.56 and 243.90

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Solution

The fourth proportional to 281.06, 387.56 and 243.90 is: 336.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.06 : 387.56 = 243.90 : x
  2. Step 2: Convert to fraction form
    281.06/387.56 = 243.90/x
  3. Step 3: Cross multiply
    281.06x = 387.56 × 243.90
  4. Step 4: Simplify right side
    281.06x = 94,525.88
  5. Step 5: Solve for x
    x = 94,525.88/281.06
  6. Step 6: Final answer
    x = 336.32

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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.