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Finding the Fourth Proportional to 485,722.80, 728,584.20 and 426,673.80

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Solution

The fourth proportional to 485,722.80, 728,584.20 and 426,673.80 is: 640,010.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,722.80 : 728,584.20 = 426,673.80 : x
  2. Step 2: Convert to fraction form
    485,722.80/728,584.20 = 426,673.80/x
  3. Step 3: Cross multiply
    485,722.80x = 728,584.20 × 426,673.80
  4. Step 4: Simplify right side
    485,722.80x = 310,867,789,233.96
  5. Step 5: Solve for x
    x = 310,867,789,233.96/485,722.80
  6. Step 6: Final answer
    x = 640,010.70

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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.