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Finding the Fourth Proportional to 3,981,623.20, 5,972,456.40 and 989,807.20

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Solution

The fourth proportional to 3,981,623.20, 5,972,456.40 and 989,807.20 is: 1,484,716.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,981,623.20 : 5,972,456.40 = 989,807.20 : x
  2. Step 2: Convert to fraction form
    3,981,623.20/5,972,456.40 = 989,807.20/x
  3. Step 3: Cross multiply
    3,981,623.20x = 5,972,456.40 × 989,807.20
  4. Step 4: Simplify right side
    3,981,623.20x = 5,911,580,346,406.08
  5. Step 5: Solve for x
    x = 5,911,580,346,406.08/3,981,623.20
  6. Step 6: Final answer
    x = 1,484,716.17

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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.