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Finding the Fourth Proportional to 861,475.20, 1,292,212.80 and 820,140.90

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Solution

The fourth proportional to 861,475.20, 1,292,212.80 and 820,140.90 is: 1,230,211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,475.20 : 1,292,212.80 = 820,140.90 : x
  2. Step 2: Convert to fraction form
    861,475.20/1,292,212.80 = 820,140.90/x
  3. Step 3: Cross multiply
    861,475.20x = 1,292,212.80 × 820,140.90
  4. Step 4: Simplify right side
    861,475.20x = 1,059,796,568,783.52
  5. Step 5: Solve for x
    x = 1,059,796,568,783.52/861,475.20
  6. Step 6: Final answer
    x = 1,230,211.35

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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.