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Finding the Fourth Proportional to 981,649.80, 1,471,610.70 and 665,080.20

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Solution

The fourth proportional to 981,649.80, 1,471,610.70 and 665,080.20 is: 997,034.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    981,649.80 : 1,471,610.70 = 665,080.20 : x
  2. Step 2: Convert to fraction form
    981,649.80/1,471,610.70 = 665,080.20/x
  3. Step 3: Cross multiply
    981,649.80x = 1,471,610.70 × 665,080.20
  4. Step 4: Simplify right side
    981,649.80x = 978,739,138,678.14
  5. Step 5: Solve for x
    x = 978,739,138,678.14/981,649.80
  6. Step 6: Final answer
    x = 997,034.93

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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.