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Finding the Fourth Proportional to 139.10, 207.45 and 126.95

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Solution

The fourth proportional to 139.10, 207.45 and 126.95 is: 189.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.10 : 207.45 = 126.95 : x
  2. Step 2: Convert to fraction form
    139.10/207.45 = 126.95/x
  3. Step 3: Cross multiply
    139.10x = 207.45 × 126.95
  4. Step 4: Simplify right side
    139.10x = 26,334.74
  5. Step 5: Solve for x
    x = 26,334.74/139.10
  6. Step 6: Final answer
    x = 189.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.