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Finding the Fourth Proportional to 721,715.88, 995,960.58 and 399,426.60

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Solution

The fourth proportional to 721,715.88, 995,960.58 and 399,426.60 is: 551,204.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,715.88 : 995,960.58 = 399,426.60 : x
  2. Step 2: Convert to fraction form
    721,715.88/995,960.58 = 399,426.60/x
  3. Step 3: Cross multiply
    721,715.88x = 995,960.58 × 399,426.60
  4. Step 4: Simplify right side
    721,715.88x = 397,813,148,203.43
  5. Step 5: Solve for x
    x = 397,813,148,203.43/721,715.88
  6. Step 6: Final answer
    x = 551,204.65

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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.