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Finding the Fourth Proportional to 235.29, 351.35 and 221.79

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Solution

The fourth proportional to 235.29, 351.35 and 221.79 is: 331.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.29 : 351.35 = 221.79 : x
  2. Step 2: Convert to fraction form
    235.29/351.35 = 221.79/x
  3. Step 3: Cross multiply
    235.29x = 351.35 × 221.79
  4. Step 4: Simplify right side
    235.29x = 77,924.81
  5. Step 5: Solve for x
    x = 77,924.81/235.29
  6. Step 6: Final answer
    x = 331.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.