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Finding the Fourth Proportional to 139.35, 208.54 and 95.81

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Solution

The fourth proportional to 139.35, 208.54 and 95.81 is: 143.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.35 : 208.54 = 95.81 : x
  2. Step 2: Convert to fraction form
    139.35/208.54 = 95.81/x
  3. Step 3: Cross multiply
    139.35x = 208.54 × 95.81
  4. Step 4: Simplify right side
    139.35x = 19,979.74
  5. Step 5: Solve for x
    x = 19,979.74/139.35
  6. Step 6: Final answer
    x = 143.38

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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.