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Finding the Fourth Proportional to 139.74, 209.40 and 112.35

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Solution

The fourth proportional to 139.74, 209.40 and 112.35 is: 168.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.74 : 209.40 = 112.35 : x
  2. Step 2: Convert to fraction form
    139.74/209.40 = 112.35/x
  3. Step 3: Cross multiply
    139.74x = 209.40 × 112.35
  4. Step 4: Simplify right side
    139.74x = 23,526.09
  5. Step 5: Solve for x
    x = 23,526.09/139.74
  6. Step 6: Final answer
    x = 168.36

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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.