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Finding the Fourth Proportional to 250.79, 345.77 and 221.42

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Solution

The fourth proportional to 250.79, 345.77 and 221.42 is: 305.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.79 : 345.77 = 221.42 : x
  2. Step 2: Convert to fraction form
    250.79/345.77 = 221.42/x
  3. Step 3: Cross multiply
    250.79x = 345.77 × 221.42
  4. Step 4: Simplify right side
    250.79x = 76,557.56
  5. Step 5: Solve for x
    x = 76,557.56/250.79
  6. Step 6: Final answer
    x = 305.27

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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.