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Finding the Fourth Proportional to 758.78, 1,138.02 and 211

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Solution

The fourth proportional to 758.78, 1,138.02 and 211 is: 316.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.78 : 1,138.02 = 211 : x
  2. Step 2: Convert to fraction form
    758.78/1,138.02 = 211/x
  3. Step 3: Cross multiply
    758.78x = 1,138.02 × 211
  4. Step 4: Simplify right side
    758.78x = 240,122.22
  5. Step 5: Solve for x
    x = 240,122.22/758.78
  6. Step 6: Final answer
    x = 316.46

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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.