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Finding the Fourth Proportional to 721,671.62, 995,938.09 and 399,381.82

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Solution

The fourth proportional to 721,671.62, 995,938.09 and 399,381.82 is: 551,164.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,671.62 : 995,938.09 = 399,381.82 : x
  2. Step 2: Convert to fraction form
    721,671.62/995,938.09 = 399,381.82/x
  3. Step 3: Cross multiply
    721,671.62x = 995,938.09 × 399,381.82
  4. Step 4: Simplify right side
    721,671.62x = 397,759,566,991.52
  5. Step 5: Solve for x
    x = 397,759,566,991.52/721,671.62
  6. Step 6: Final answer
    x = 551,164.21

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Double scale
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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.