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Finding the Fourth Proportional to 986,879.80, 1,478,351.40 and 687,698.20

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Solution

The fourth proportional to 986,879.80, 1,478,351.40 and 687,698.20 is: 1,030,175.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    986,879.80 : 1,478,351.40 = 687,698.20 : x
  2. Step 2: Convert to fraction form
    986,879.80/1,478,351.40 = 687,698.20/x
  3. Step 3: Cross multiply
    986,879.80x = 1,478,351.40 × 687,698.20
  4. Step 4: Simplify right side
    986,879.80x = 1,016,659,596,747.48
  5. Step 5: Solve for x
    x = 1,016,659,596,747.48/986,879.80
  6. Step 6: Final answer
    x = 1,030,175.71

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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.