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Finding the Fourth Proportional to 919.65, 1,379.80 and 480.97

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Solution

The fourth proportional to 919.65, 1,379.80 and 480.97 is: 721.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.65 : 1,379.80 = 480.97 : x
  2. Step 2: Convert to fraction form
    919.65/1,379.80 = 480.97/x
  3. Step 3: Cross multiply
    919.65x = 1,379.80 × 480.97
  4. Step 4: Simplify right side
    919.65x = 663,644.73
  5. Step 5: Solve for x
    x = 663,644.73/919.65
  6. Step 6: Final answer
    x = 721.62

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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.