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Finding the Fourth Proportional to 138.93, 191.43 and 101.49

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Solution

The fourth proportional to 138.93, 191.43 and 101.49 is: 139.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.93 : 191.43 = 101.49 : x
  2. Step 2: Convert to fraction form
    138.93/191.43 = 101.49/x
  3. Step 3: Cross multiply
    138.93x = 191.43 × 101.49
  4. Step 4: Simplify right side
    138.93x = 19,428.23
  5. Step 5: Solve for x
    x = 19,428.23/138.93
  6. Step 6: Final answer
    x = 139.84

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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.