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Finding the Fourth Proportional to 819,620.40, 1,229,430.60 and 689,712.60

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Solution

The fourth proportional to 819,620.40, 1,229,430.60 and 689,712.60 is: 1,034,568.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,620.40 : 1,229,430.60 = 689,712.60 : x
  2. Step 2: Convert to fraction form
    819,620.40/1,229,430.60 = 689,712.60/x
  3. Step 3: Cross multiply
    819,620.40x = 1,229,430.60 × 689,712.60
  4. Step 4: Simplify right side
    819,620.40x = 847,953,775,645.56
  5. Step 5: Solve for x
    x = 847,953,775,645.56/819,620.40
  6. Step 6: Final answer
    x = 1,034,568.90

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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.