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Finding the Fourth Proportional to 138.99, 191.83 and 103.65

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Solution

The fourth proportional to 138.99, 191.83 and 103.65 is: 143.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.99 : 191.83 = 103.65 : x
  2. Step 2: Convert to fraction form
    138.99/191.83 = 103.65/x
  3. Step 3: Cross multiply
    138.99x = 191.83 × 103.65
  4. Step 4: Simplify right side
    138.99x = 19,883.18
  5. Step 5: Solve for x
    x = 19,883.18/138.99
  6. Step 6: Final answer
    x = 143.05

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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.