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Finding the Fourth Proportional to 721,671.78, 995,892.12 and 399,362.70

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Solution

The fourth proportional to 721,671.78, 995,892.12 and 399,362.70 is: 551,112.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,671.78 : 995,892.12 = 399,362.70 : x
  2. Step 2: Convert to fraction form
    721,671.78/995,892.12 = 399,362.70/x
  3. Step 3: Cross multiply
    721,671.78x = 995,892.12 × 399,362.70
  4. Step 4: Simplify right side
    721,671.78x = 397,722,165,951.92
  5. Step 5: Solve for x
    x = 397,722,165,951.92/721,671.78
  6. Step 6: Final answer
    x = 551,112.26

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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.