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Finding the Fourth Proportional to 250.66, 345.36 and 211.78

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Solution

The fourth proportional to 250.66, 345.36 and 211.78 is: 291.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.66 : 345.36 = 211.78 : x
  2. Step 2: Convert to fraction form
    250.66/345.36 = 211.78/x
  3. Step 3: Cross multiply
    250.66x = 345.36 × 211.78
  4. Step 4: Simplify right side
    250.66x = 73,140.34
  5. Step 5: Solve for x
    x = 73,140.34/250.66
  6. Step 6: Final answer
    x = 291.79

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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.