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Finding the Fourth Proportional to 187.70, 281 and 139.82

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Solution

The fourth proportional to 187.70, 281 and 139.82 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.70 : 281 = 139.82 : x
  2. Step 2: Convert to fraction form
    187.70/281 = 139.82/x
  3. Step 3: Cross multiply
    187.70x = 281 × 139.82
  4. Step 4: Simplify right side
    187.70x = 39,289.42
  5. Step 5: Solve for x
    x = 39,289.42/187.70
  6. Step 6: Final answer
    x = 209.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.