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Finding the Fourth Proportional to 721,462.84, 995,648.07 and 399,167.71

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Solution

The fourth proportional to 721,462.84, 995,648.07 and 399,167.71 is: 550,867.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,462.84 : 995,648.07 = 399,167.71 : x
  2. Step 2: Convert to fraction form
    721,462.84/995,648.07 = 399,167.71/x
  3. Step 3: Cross multiply
    721,462.84x = 995,648.07 × 399,167.71
  4. Step 4: Simplify right side
    721,462.84x = 397,430,560,067.82
  5. Step 5: Solve for x
    x = 397,430,560,067.82/721,462.84
  6. Step 6: Final answer
    x = 550,867.68

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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.