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Finding the Fourth Proportional to 139.44, 209.18 and 48.17

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Solution

The fourth proportional to 139.44, 209.18 and 48.17 is: 72.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 209.18 = 48.17 : x
  2. Step 2: Convert to fraction form
    139.44/209.18 = 48.17/x
  3. Step 3: Cross multiply
    139.44x = 209.18 × 48.17
  4. Step 4: Simplify right side
    139.44x = 10,075.28
  5. Step 5: Solve for x
    x = 10,075.28/139.44
  6. Step 6: Final answer
    x = 72.26

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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.