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Finding the Fourth Proportional to 978,384.20, 1,467,576.30 and 820,920.20

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Solution

The fourth proportional to 978,384.20, 1,467,576.30 and 820,920.20 is: 1,231,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,384.20 : 1,467,576.30 = 820,920.20 : x
  2. Step 2: Convert to fraction form
    978,384.20/1,467,576.30 = 820,920.20/x
  3. Step 3: Cross multiply
    978,384.20x = 1,467,576.30 × 820,920.20
  4. Step 4: Simplify right side
    978,384.20x = 1,204,763,029,711.26
  5. Step 5: Solve for x
    x = 1,204,763,029,711.26/978,384.20
  6. Step 6: Final answer
    x = 1,231,380.30

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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.