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Finding the Fourth Proportional to 139.58, 192.63 and 77.42

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Solution

The fourth proportional to 139.58, 192.63 and 77.42 is: 106.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.58 : 192.63 = 77.42 : x
  2. Step 2: Convert to fraction form
    139.58/192.63 = 77.42/x
  3. Step 3: Cross multiply
    139.58x = 192.63 × 77.42
  4. Step 4: Simplify right side
    139.58x = 14,912.45
  5. Step 5: Solve for x
    x = 14,912.45/139.58
  6. Step 6: Final answer
    x = 106.84

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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.