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Finding the Fourth Proportional to 388.10, 535.59 and 222.31

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Solution

The fourth proportional to 388.10, 535.59 and 222.31 is: 306.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.10 : 535.59 = 222.31 : x
  2. Step 2: Convert to fraction form
    388.10/535.59 = 222.31/x
  3. Step 3: Cross multiply
    388.10x = 535.59 × 222.31
  4. Step 4: Simplify right side
    388.10x = 119,065.67
  5. Step 5: Solve for x
    x = 119,065.67/388.10
  6. Step 6: Final answer
    x = 306.79

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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.