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Finding the Fourth Proportional to 721,440.09, 995,616.63 and 399,144.94

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Solution

The fourth proportional to 721,440.09, 995,616.63 and 399,144.94 is: 550,836.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,440.09 : 995,616.63 = 399,144.94 : x
  2. Step 2: Convert to fraction form
    721,440.09/995,616.63 = 399,144.94/x
  3. Step 3: Cross multiply
    721,440.09x = 995,616.63 × 399,144.94
  4. Step 4: Simplify right side
    721,440.09x = 397,395,337,555.31
  5. Step 5: Solve for x
    x = 397,395,337,555.31/721,440.09
  6. Step 6: Final answer
    x = 550,836.23

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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.