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Finding the Fourth Proportional to 139.46, 191.98 and 137.84

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Solution

The fourth proportional to 139.46, 191.98 and 137.84 is: 189.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 191.98 = 137.84 : x
  2. Step 2: Convert to fraction form
    139.46/191.98 = 137.84/x
  3. Step 3: Cross multiply
    139.46x = 191.98 × 137.84
  4. Step 4: Simplify right side
    139.46x = 26,462.52
  5. Step 5: Solve for x
    x = 26,462.52/139.46
  6. Step 6: Final answer
    x = 189.75

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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.