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Finding the Fourth Proportional to 480.50, 721.00 and 261.28

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Solution

The fourth proportional to 480.50, 721.00 and 261.28 is: 392.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.50 : 721.00 = 261.28 : x
  2. Step 2: Convert to fraction form
    480.50/721.00 = 261.28/x
  3. Step 3: Cross multiply
    480.50x = 721.00 × 261.28
  4. Step 4: Simplify right side
    480.50x = 188,384.11
  5. Step 5: Solve for x
    x = 188,384.11/480.50
  6. Step 6: Final answer
    x = 392.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.