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Finding the Fourth Proportional to 139.09, 191.76 and 102.25

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Solution

The fourth proportional to 139.09, 191.76 and 102.25 is: 140.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.09 : 191.76 = 102.25 : x
  2. Step 2: Convert to fraction form
    139.09/191.76 = 102.25/x
  3. Step 3: Cross multiply
    139.09x = 191.76 × 102.25
  4. Step 4: Simplify right side
    139.09x = 19,607.46
  5. Step 5: Solve for x
    x = 19,607.46/139.09
  6. Step 6: Final answer
    x = 140.97

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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.