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Finding the Fourth Proportional to 187.17, 281.03 and 138.57

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Solution

The fourth proportional to 187.17, 281.03 and 138.57 is: 208.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.17 : 281.03 = 138.57 : x
  2. Step 2: Convert to fraction form
    187.17/281.03 = 138.57/x
  3. Step 3: Cross multiply
    187.17x = 281.03 × 138.57
  4. Step 4: Simplify right side
    187.17x = 38,941.63
  5. Step 5: Solve for x
    x = 38,941.63/187.17
  6. Step 6: Final answer
    x = 208.05

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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.