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Finding the Fourth Proportional to 398.16, 548.88 and 242.88

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Solution

The fourth proportional to 398.16, 548.88 and 242.88 is: 334.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.16 : 548.88 = 242.88 : x
  2. Step 2: Convert to fraction form
    398.16/548.88 = 242.88/x
  3. Step 3: Cross multiply
    398.16x = 548.88 × 242.88
  4. Step 4: Simplify right side
    398.16x = 133,311.97
  5. Step 5: Solve for x
    x = 133,311.97/398.16
  6. Step 6: Final answer
    x = 334.82

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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.