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Finding the Fourth Proportional to 221.00, 330.24 and 215.87

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Solution

The fourth proportional to 221.00, 330.24 and 215.87 is: 322.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.00 : 330.24 = 215.87 : x
  2. Step 2: Convert to fraction form
    221.00/330.24 = 215.87/x
  3. Step 3: Cross multiply
    221.00x = 330.24 × 215.87
  4. Step 4: Simplify right side
    221.00x = 71,288.07
  5. Step 5: Solve for x
    x = 71,288.07/221.00
  6. Step 6: Final answer
    x = 322.58

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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.