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Finding the Fourth Proportional to 139.82, 208.76 and 126.18

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Solution

The fourth proportional to 139.82, 208.76 and 126.18 is: 188.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.82 : 208.76 = 126.18 : x
  2. Step 2: Convert to fraction form
    139.82/208.76 = 126.18/x
  3. Step 3: Cross multiply
    139.82x = 208.76 × 126.18
  4. Step 4: Simplify right side
    139.82x = 26,341.34
  5. Step 5: Solve for x
    x = 26,341.34/139.82
  6. Step 6: Final answer
    x = 188.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.