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Finding the Fourth Proportional to 187.67, 281.27 and 139.13

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Solution

The fourth proportional to 187.67, 281.27 and 139.13 is: 208.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.67 : 281.27 = 139.13 : x
  2. Step 2: Convert to fraction form
    187.67/281.27 = 139.13/x
  3. Step 3: Cross multiply
    187.67x = 281.27 × 139.13
  4. Step 4: Simplify right side
    187.67x = 39,130.99
  5. Step 5: Solve for x
    x = 39,130.99/187.67
  6. Step 6: Final answer
    x = 208.51

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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.