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Finding the Fourth Proportional to 204.16, 281.56 and 138.72

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Solution

The fourth proportional to 204.16, 281.56 and 138.72 is: 191.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.16 : 281.56 = 138.72 : x
  2. Step 2: Convert to fraction form
    204.16/281.56 = 138.72/x
  3. Step 3: Cross multiply
    204.16x = 281.56 × 138.72
  4. Step 4: Simplify right side
    204.16x = 39,058.00
  5. Step 5: Solve for x
    x = 39,058.00/204.16
  6. Step 6: Final answer
    x = 191.31

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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.