Home / 1,991,103.75-2,986,401.42-643,126.32

Finding the Fourth Proportional to 1,991,103.75, 2,986,401.42 and 643,126.32

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Solution

The fourth proportional to 1,991,103.75, 2,986,401.42 and 643,126.32 is: 964,607.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991,103.75 : 2,986,401.42 = 643,126.32 : x
  2. Step 2: Convert to fraction form
    1,991,103.75/2,986,401.42 = 643,126.32/x
  3. Step 3: Cross multiply
    1,991,103.75x = 2,986,401.42 × 643,126.32
  4. Step 4: Simplify right side
    1,991,103.75x = 1,920,633,355,287.37
  5. Step 5: Solve for x
    x = 1,920,633,355,287.37/1,991,103.75
  6. Step 6: Final answer
    x = 964,607.37

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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.