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Finding the Fourth Proportional to 979.65, 1,474.81 and 845.73

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Solution

The fourth proportional to 979.65, 1,474.81 and 845.73 is: 1,273.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.65 : 1,474.81 = 845.73 : x
  2. Step 2: Convert to fraction form
    979.65/1,474.81 = 845.73/x
  3. Step 3: Cross multiply
    979.65x = 1,474.81 × 845.73
  4. Step 4: Simplify right side
    979.65x = 1,247,288.95
  5. Step 5: Solve for x
    x = 1,247,288.95/979.65
  6. Step 6: Final answer
    x = 1,273.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.