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Finding the Fourth Proportional to 213.46, 294.55 and 139.79

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Solution

The fourth proportional to 213.46, 294.55 and 139.79 is: 192.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.46 : 294.55 = 139.79 : x
  2. Step 2: Convert to fraction form
    213.46/294.55 = 139.79/x
  3. Step 3: Cross multiply
    213.46x = 294.55 × 139.79
  4. Step 4: Simplify right side
    213.46x = 41,175.14
  5. Step 5: Solve for x
    x = 41,175.14/213.46
  6. Step 6: Final answer
    x = 192.89

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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.