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Finding the Fourth Proportional to 480.09, 720.42 and 315.76

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Solution

The fourth proportional to 480.09, 720.42 and 315.76 is: 473.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.09 : 720.42 = 315.76 : x
  2. Step 2: Convert to fraction form
    480.09/720.42 = 315.76/x
  3. Step 3: Cross multiply
    480.09x = 720.42 × 315.76
  4. Step 4: Simplify right side
    480.09x = 227,480.04
  5. Step 5: Solve for x
    x = 227,480.04/480.09
  6. Step 6: Final answer
    x = 473.83

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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.