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Finding the Fourth Proportional to 853,694.80, 1,280,542.20 and 687,806.80

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Solution

The fourth proportional to 853,694.80, 1,280,542.20 and 687,806.80 is: 1,031,710.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    853,694.80 : 1,280,542.20 = 687,806.80 : x
  2. Step 2: Convert to fraction form
    853,694.80/1,280,542.20 = 687,806.80/x
  3. Step 3: Cross multiply
    853,694.80x = 1,280,542.20 × 687,806.80
  4. Step 4: Simplify right side
    853,694.80x = 880,765,632,846.96
  5. Step 5: Solve for x
    x = 880,765,632,846.96/853,694.80
  6. Step 6: Final answer
    x = 1,031,710.20

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1.5x scale

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.