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Finding the Fourth Proportional to 388.09, 535.56 and 222.30

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Solution

The fourth proportional to 388.09, 535.56 and 222.30 is: 306.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.09 : 535.56 = 222.30 : x
  2. Step 2: Convert to fraction form
    388.09/535.56 = 222.30/x
  3. Step 3: Cross multiply
    388.09x = 535.56 × 222.30
  4. Step 4: Simplify right side
    388.09x = 119,054.99
  5. Step 5: Solve for x
    x = 119,054.99/388.09
  6. Step 6: Final answer
    x = 306.77

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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.