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Finding the Fourth Proportional to 485,108.40, 727,792.20 and 432,879.60

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Solution

The fourth proportional to 485,108.40, 727,792.20 and 432,879.60 is: 649,435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,108.40 : 727,792.20 = 432,879.60 : x
  2. Step 2: Convert to fraction form
    485,108.40/727,792.20 = 432,879.60/x
  3. Step 3: Cross multiply
    485,108.40x = 727,792.20 × 432,879.60
  4. Step 4: Simplify right side
    485,108.40x = 315,046,396,419.12
  5. Step 5: Solve for x
    x = 315,046,396,419.12/485,108.40
  6. Step 6: Final answer
    x = 649,435.05

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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.