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Finding the Fourth Proportional to 139.00, 191.82 and 79.99

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Solution

The fourth proportional to 139.00, 191.82 and 79.99 is: 110.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.00 : 191.82 = 79.99 : x
  2. Step 2: Convert to fraction form
    139.00/191.82 = 79.99/x
  3. Step 3: Cross multiply
    139.00x = 191.82 × 79.99
  4. Step 4: Simplify right side
    139.00x = 15,343.02
  5. Step 5: Solve for x
    x = 15,343.02/139.00
  6. Step 6: Final answer
    x = 110.38

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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.