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Finding the Fourth Proportional to 721,670.12, 995,936.02 and 399,380.32

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Solution

The fourth proportional to 721,670.12, 995,936.02 and 399,380.32 is: 551,162.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,670.12 : 995,936.02 = 399,380.32 : x
  2. Step 2: Convert to fraction form
    721,670.12/995,936.02 = 399,380.32/x
  3. Step 3: Cross multiply
    721,670.12x = 995,936.02 × 399,380.32
  4. Step 4: Simplify right side
    721,670.12x = 397,757,242,878.84
  5. Step 5: Solve for x
    x = 397,757,242,878.84/721,670.12
  6. Step 6: Final answer
    x = 551,162.14

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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.