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Finding the Fourth Proportional to 721,314.96, 995,406.12 and 398,999.76

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Solution

The fourth proportional to 721,314.96, 995,406.12 and 398,999.76 is: 550,614.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,314.96 : 995,406.12 = 398,999.76 : x
  2. Step 2: Convert to fraction form
    721,314.96/995,406.12 = 398,999.76/x
  3. Step 3: Cross multiply
    721,314.96x = 995,406.12 × 398,999.76
  4. Step 4: Simplify right side
    721,314.96x = 397,166,802,982.53
  5. Step 5: Solve for x
    x = 397,166,802,982.53/721,314.96
  6. Step 6: Final answer
    x = 550,614.95

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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.