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Finding the Fourth Proportional to 1,986,079.74, 2,978,676.24 and 920,983.41

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Solution

The fourth proportional to 1,986,079.74, 2,978,676.24 and 920,983.41 is: 1,381,269.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986,079.74 : 2,978,676.24 = 920,983.41 : x
  2. Step 2: Convert to fraction form
    1,986,079.74/2,978,676.24 = 920,983.41/x
  3. Step 3: Cross multiply
    1,986,079.74x = 2,978,676.24 × 920,983.41
  4. Step 4: Simplify right side
    1,986,079.74x = 2,743,311,391,357.99
  5. Step 5: Solve for x
    x = 2,743,311,391,357.99/1,986,079.74
  6. Step 6: Final answer
    x = 1,381,269.51

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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.