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Finding the Fourth Proportional to 480.39, 663 and 281.28

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Solution

The fourth proportional to 480.39, 663 and 281.28 is: 388.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.39 : 663 = 281.28 : x
  2. Step 2: Convert to fraction form
    480.39/663 = 281.28/x
  3. Step 3: Cross multiply
    480.39x = 663 × 281.28
  4. Step 4: Simplify right side
    480.39x = 186,488.64
  5. Step 5: Solve for x
    x = 186,488.64/480.39
  6. Step 6: Final answer
    x = 388.20

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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.