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Finding the Fourth Proportional to 281.03, 387.98 and 187.91

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Solution

The fourth proportional to 281.03, 387.98 and 187.91 is: 259.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.03 : 387.98 = 187.91 : x
  2. Step 2: Convert to fraction form
    281.03/387.98 = 187.91/x
  3. Step 3: Cross multiply
    281.03x = 387.98 × 187.91
  4. Step 4: Simplify right side
    281.03x = 72,902.44
  5. Step 5: Solve for x
    x = 72,902.44/281.03
  6. Step 6: Final answer
    x = 259.42

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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.