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Finding the Fourth Proportional to 667,640.98, 920,429.48 and 422,503.80

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Solution

The fourth proportional to 667,640.98, 920,429.48 and 422,503.80 is: 582,476.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,640.98 : 920,429.48 = 422,503.80 : x
  2. Step 2: Convert to fraction form
    667,640.98/920,429.48 = 422,503.80/x
  3. Step 3: Cross multiply
    667,640.98x = 920,429.48 × 422,503.80
  4. Step 4: Simplify right side
    667,640.98x = 388,884,948,160.09
  5. Step 5: Solve for x
    x = 388,884,948,160.09/667,640.98
  6. Step 6: Final answer
    x = 582,476.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.