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Finding the Fourth Proportional to 2,660,623.80, 3,990,935.70 and 978,934.20

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Solution

The fourth proportional to 2,660,623.80, 3,990,935.70 and 978,934.20 is: 1,468,401.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660,623.80 : 3,990,935.70 = 978,934.20 : x
  2. Step 2: Convert to fraction form
    2,660,623.80/3,990,935.70 = 978,934.20/x
  3. Step 3: Cross multiply
    2,660,623.80x = 3,990,935.70 × 978,934.20
  4. Step 4: Simplify right side
    2,660,623.80x = 3,906,863,446,730.94
  5. Step 5: Solve for x
    x = 3,906,863,446,730.94/2,660,623.80
  6. Step 6: Final answer
    x = 1,468,401.30

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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.