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Finding the Fourth Proportional to 640,007.80, 959,136.90 and 426,167.80

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Solution

The fourth proportional to 640,007.80, 959,136.90 and 426,167.80 is: 638,669.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,007.80 : 959,136.90 = 426,167.80 : x
  2. Step 2: Convert to fraction form
    640,007.80/959,136.90 = 426,167.80/x
  3. Step 3: Cross multiply
    640,007.80x = 959,136.90 × 426,167.80
  4. Step 4: Simplify right side
    640,007.80x = 408,753,262,571.82
  5. Step 5: Solve for x
    x = 408,753,262,571.82/640,007.80
  6. Step 6: Final answer
    x = 638,669.19

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1.5x scale

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.