Home / 812,078.40-1,214,661.60-728,443.20

Finding the Fourth Proportional to 812,078.40, 1,214,661.60 and 728,443.20

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Solution

The fourth proportional to 812,078.40, 1,214,661.60 and 728,443.20 is: 1,089,564.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,078.40 : 1,214,661.60 = 728,443.20 : x
  2. Step 2: Convert to fraction form
    812,078.40/1,214,661.60 = 728,443.20/x
  3. Step 3: Cross multiply
    812,078.40x = 1,214,661.60 × 728,443.20
  4. Step 4: Simplify right side
    812,078.40x = 884,811,982,821.12
  5. Step 5: Solve for x
    x = 884,811,982,821.12/812,078.40
  6. Step 6: Final answer
    x = 1,089,564.73

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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.