Home / 812,135.40-1,214,747.10-728,500.20

Finding the Fourth Proportional to 812,135.40, 1,214,747.10 and 728,500.20

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Solution

The fourth proportional to 812,135.40, 1,214,747.10 and 728,500.20 is: 1,089,650.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,135.40 : 1,214,747.10 = 728,500.20 : x
  2. Step 2: Convert to fraction form
    812,135.40/1,214,747.10 = 728,500.20/x
  3. Step 3: Cross multiply
    812,135.40x = 1,214,747.10 × 728,500.20
  4. Step 4: Simplify right side
    812,135.40x = 884,943,505,299.42
  5. Step 5: Solve for x
    x = 884,943,505,299.42/812,135.40
  6. Step 6: Final answer
    x = 1,089,650.21

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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.