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Finding the Fourth Proportional to 221.77, 332.11 and 215.29

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Solution

The fourth proportional to 221.77, 332.11 and 215.29 is: 322.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.77 : 332.11 = 215.29 : x
  2. Step 2: Convert to fraction form
    221.77/332.11 = 215.29/x
  3. Step 3: Cross multiply
    221.77x = 332.11 × 215.29
  4. Step 4: Simplify right side
    221.77x = 71,497.22
  5. Step 5: Solve for x
    x = 71,497.22/221.77
  6. Step 6: Final answer
    x = 322.40

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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.