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Finding the Fourth Proportional to 721,507.38, 995,670.27 and 399,211.62

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Solution

The fourth proportional to 721,507.38, 995,670.27 and 399,211.62 is: 550,906.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,507.38 : 995,670.27 = 399,211.62 : x
  2. Step 2: Convert to fraction form
    721,507.38/995,670.27 = 399,211.62/x
  3. Step 3: Cross multiply
    721,507.38x = 995,670.27 × 399,211.62
  4. Step 4: Simplify right side
    721,507.38x = 397,483,141,472.54
  5. Step 5: Solve for x
    x = 397,483,141,472.54/721,507.38
  6. Step 6: Final answer
    x = 550,906.55

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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.