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Finding the Fourth Proportional to 221.99, 333.06 and 85.07

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Solution

The fourth proportional to 221.99, 333.06 and 85.07 is: 127.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.99 : 333.06 = 85.07 : x
  2. Step 2: Convert to fraction form
    221.99/333.06 = 85.07/x
  3. Step 3: Cross multiply
    221.99x = 333.06 × 85.07
  4. Step 4: Simplify right side
    221.99x = 28,333.93
  5. Step 5: Solve for x
    x = 28,333.93/221.99
  6. Step 6: Final answer
    x = 127.64

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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.