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Finding the Fourth Proportional to 721,161.90, 995,178.60 and 398,871

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Solution

The fourth proportional to 721,161.90, 995,178.60 and 398,871 is: 550,428.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,161.90 : 995,178.60 = 398,871 : x
  2. Step 2: Convert to fraction form
    721,161.90/995,178.60 = 398,871/x
  3. Step 3: Cross multiply
    721,161.90x = 995,178.60 × 398,871
  4. Step 4: Simplify right side
    721,161.90x = 396,947,883,360.60
  5. Step 5: Solve for x
    x = 396,947,883,360.60/721,161.90
  6. Step 6: Final answer
    x = 550,428.25

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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.