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Finding the Fourth Proportional to 139.26, 192.17 and 77.08

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Solution

The fourth proportional to 139.26, 192.17 and 77.08 is: 106.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 192.17 = 77.08 : x
  2. Step 2: Convert to fraction form
    139.26/192.17 = 77.08/x
  3. Step 3: Cross multiply
    139.26x = 192.17 × 77.08
  4. Step 4: Simplify right side
    139.26x = 14,812.80
  5. Step 5: Solve for x
    x = 14,812.80/139.26
  6. Step 6: Final answer
    x = 106.37

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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.