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Finding the Fourth Proportional to 480.40, 720.63 and 220.39

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Solution

The fourth proportional to 480.40, 720.63 and 220.39 is: 330.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.40 : 720.63 = 220.39 : x
  2. Step 2: Convert to fraction form
    480.40/720.63 = 220.39/x
  3. Step 3: Cross multiply
    480.40x = 720.63 × 220.39
  4. Step 4: Simplify right side
    480.40x = 158,817.84
  5. Step 5: Solve for x
    x = 158,817.84/480.40
  6. Step 6: Final answer
    x = 330.60

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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.