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Finding the Fourth Proportional to 640,840.54, 961,471.26 and 262,079.82

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Solution

The fourth proportional to 640,840.54, 961,471.26 and 262,079.82 is: 393,205.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,840.54 : 961,471.26 = 262,079.82 : x
  2. Step 2: Convert to fraction form
    640,840.54/961,471.26 = 262,079.82/x
  3. Step 3: Cross multiply
    640,840.54x = 961,471.26 × 262,079.82
  4. Step 4: Simplify right side
    640,840.54x = 251,982,214,755.97
  5. Step 5: Solve for x
    x = 251,982,214,755.97/640,840.54
  6. Step 6: Final answer
    x = 393,205.80

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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.