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Finding the Fourth Proportional to 138.10, 208.11 and 118.07

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Solution

The fourth proportional to 138.10, 208.11 and 118.07 is: 177.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.10 : 208.11 = 118.07 : x
  2. Step 2: Convert to fraction form
    138.10/208.11 = 118.07/x
  3. Step 3: Cross multiply
    138.10x = 208.11 × 118.07
  4. Step 4: Simplify right side
    138.10x = 24,570.96
  5. Step 5: Solve for x
    x = 24,570.96/138.10
  6. Step 6: Final answer
    x = 177.93

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.