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Finding the Fourth Proportional to 480.47, 720.68 and 133.80

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Solution

The fourth proportional to 480.47, 720.68 and 133.80 is: 200.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.47 : 720.68 = 133.80 : x
  2. Step 2: Convert to fraction form
    480.47/720.68 = 133.80/x
  3. Step 3: Cross multiply
    480.47x = 720.68 × 133.80
  4. Step 4: Simplify right side
    480.47x = 96,426.32
  5. Step 5: Solve for x
    x = 96,426.32/480.47
  6. Step 6: Final answer
    x = 200.69

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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.