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Finding the Fourth Proportional to 426,560.20, 640,061.10 and 174,025.80

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Solution

The fourth proportional to 426,560.20, 640,061.10 and 174,025.80 is: 261,128.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,560.20 : 640,061.10 = 174,025.80 : x
  2. Step 2: Convert to fraction form
    426,560.20/640,061.10 = 174,025.80/x
  3. Step 3: Cross multiply
    426,560.20x = 640,061.10 × 174,025.80
  4. Step 4: Simplify right side
    426,560.20x = 111,387,144,976.38
  5. Step 5: Solve for x
    x = 111,387,144,976.38/426,560.20
  6. Step 6: Final answer
    x = 261,128.78

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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.