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Finding the Fourth Proportional to 480.75, 720.21 and 383.45

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Solution

The fourth proportional to 480.75, 720.21 and 383.45 is: 574.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.75 : 720.21 = 383.45 : x
  2. Step 2: Convert to fraction form
    480.75/720.21 = 383.45/x
  3. Step 3: Cross multiply
    480.75x = 720.21 × 383.45
  4. Step 4: Simplify right side
    480.75x = 276,160.92
  5. Step 5: Solve for x
    x = 276,160.92/480.75
  6. Step 6: Final answer
    x = 574.44

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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.