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Finding the Fourth Proportional to 981,640.80, 1,471,597.20 and 665,071.20

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Solution

The fourth proportional to 981,640.80, 1,471,597.20 and 665,071.20 is: 997,021.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    981,640.80 : 1,471,597.20 = 665,071.20 : x
  2. Step 2: Convert to fraction form
    981,640.80/1,471,597.20 = 665,071.20/x
  3. Step 3: Cross multiply
    981,640.80x = 1,471,597.20 × 665,071.20
  4. Step 4: Simplify right side
    981,640.80x = 978,716,915,720.64
  5. Step 5: Solve for x
    x = 978,716,915,720.64/981,640.80
  6. Step 6: Final answer
    x = 997,021.43

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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.