Home / 812,939.64-1,121,404.75-640,221.32

Finding the Fourth Proportional to 812,939.64, 1,121,404.75 and 640,221.32

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Solution

The fourth proportional to 812,939.64, 1,121,404.75 and 640,221.32 is: 883,149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,939.64 : 1,121,404.75 = 640,221.32 : x
  2. Step 2: Convert to fraction form
    812,939.64/1,121,404.75 = 640,221.32/x
  3. Step 3: Cross multiply
    812,939.64x = 1,121,404.75 × 640,221.32
  4. Step 4: Simplify right side
    812,939.64x = 717,947,227,795.57
  5. Step 5: Solve for x
    x = 717,947,227,795.57/812,939.64
  6. Step 6: Final answer
    x = 883,149.49

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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.