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Finding the Fourth Proportional to 480.12, 720.21 and 191.76

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Solution

The fourth proportional to 480.12, 720.21 and 191.76 is: 287.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.12 : 720.21 = 191.76 : x
  2. Step 2: Convert to fraction form
    480.12/720.21 = 191.76/x
  3. Step 3: Cross multiply
    480.12x = 720.21 × 191.76
  4. Step 4: Simplify right side
    480.12x = 138,107.47
  5. Step 5: Solve for x
    x = 138,107.47/480.12
  6. Step 6: Final answer
    x = 287.65

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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.