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Finding the Fourth Proportional to 213.80, 294.85 and 139.08

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Solution

The fourth proportional to 213.80, 294.85 and 139.08 is: 191.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.80 : 294.85 = 139.08 : x
  2. Step 2: Convert to fraction form
    213.80/294.85 = 139.08/x
  3. Step 3: Cross multiply
    213.80x = 294.85 × 139.08
  4. Step 4: Simplify right side
    213.80x = 41,007.39
  5. Step 5: Solve for x
    x = 41,007.39/213.80
  6. Step 6: Final answer
    x = 191.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.