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Finding the Fourth Proportional to 139.51, 209.36 and 67.38

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Solution

The fourth proportional to 139.51, 209.36 and 67.38 is: 101.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.51 : 209.36 = 67.38 : x
  2. Step 2: Convert to fraction form
    139.51/209.36 = 67.38/x
  3. Step 3: Cross multiply
    139.51x = 209.36 × 67.38
  4. Step 4: Simplify right side
    139.51x = 14,106.68
  5. Step 5: Solve for x
    x = 14,106.68/139.51
  6. Step 6: Final answer
    x = 101.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.