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Finding the Fourth Proportional to 138.82, 208.17 and 47.50

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Solution

The fourth proportional to 138.82, 208.17 and 47.50 is: 71.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.82 : 208.17 = 47.50 : x
  2. Step 2: Convert to fraction form
    138.82/208.17 = 47.50/x
  3. Step 3: Cross multiply
    138.82x = 208.17 × 47.50
  4. Step 4: Simplify right side
    138.82x = 9,888.08
  5. Step 5: Solve for x
    x = 9,888.08/138.82
  6. Step 6: Final answer
    x = 71.23

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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.