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Finding the Fourth Proportional to 480.98, 663.63 and 281.78

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Solution

The fourth proportional to 480.98, 663.63 and 281.78 is: 388.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.98 : 663.63 = 281.78 : x
  2. Step 2: Convert to fraction form
    480.98/663.63 = 281.78/x
  3. Step 3: Cross multiply
    480.98x = 663.63 × 281.78
  4. Step 4: Simplify right side
    480.98x = 186,997.66
  5. Step 5: Solve for x
    x = 186,997.66/480.98
  6. Step 6: Final answer
    x = 388.78

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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.