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Finding the Fourth Proportional to 388.18, 535.64 and 222.40

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Solution

The fourth proportional to 388.18, 535.64 and 222.40 is: 306.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.18 : 535.64 = 222.40 : x
  2. Step 2: Convert to fraction form
    388.18/535.64 = 222.40/x
  3. Step 3: Cross multiply
    388.18x = 535.64 × 222.40
  4. Step 4: Simplify right side
    388.18x = 119,126.34
  5. Step 5: Solve for x
    x = 119,126.34/388.18
  6. Step 6: Final answer
    x = 306.88

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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.