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Finding the Fourth Proportional to 978,471.20, 1,467,706.80 and 821,007.20

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Solution

The fourth proportional to 978,471.20, 1,467,706.80 and 821,007.20 is: 1,231,510.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,471.20 : 1,467,706.80 = 821,007.20 : x
  2. Step 2: Convert to fraction form
    978,471.20/1,467,706.80 = 821,007.20/x
  3. Step 3: Cross multiply
    978,471.20x = 1,467,706.80 × 821,007.20
  4. Step 4: Simplify right side
    978,471.20x = 1,204,997,850,288.96
  5. Step 5: Solve for x
    x = 1,204,997,850,288.96/978,471.20
  6. Step 6: Final answer
    x = 1,231,510.80

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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.