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Finding the Fourth Proportional to 139.49, 209.20 and 48.19

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Solution

The fourth proportional to 139.49, 209.20 and 48.19 is: 72.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.49 : 209.20 = 48.19 : x
  2. Step 2: Convert to fraction form
    139.49/209.20 = 48.19/x
  3. Step 3: Cross multiply
    139.49x = 209.20 × 48.19
  4. Step 4: Simplify right side
    139.49x = 10,081.35
  5. Step 5: Solve for x
    x = 10,081.35/139.49
  6. Step 6: Final answer
    x = 72.27

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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.