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Finding the Fourth Proportional to 721,188.81, 995,173.63 and 398,892

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Solution

The fourth proportional to 721,188.81, 995,173.63 and 398,892 is: 550,433.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,188.81 : 995,173.63 = 398,892 : x
  2. Step 2: Convert to fraction form
    721,188.81/995,173.63 = 398,892/x
  3. Step 3: Cross multiply
    721,188.81x = 995,173.63 × 398,892
  4. Step 4: Simplify right side
    721,188.81x = 396,966,799,617.96
  5. Step 5: Solve for x
    x = 396,966,799,617.96/721,188.81
  6. Step 6: Final answer
    x = 550,433.94

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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.