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Finding the Fourth Proportional to 721,338.36, 995,476.28 and 399,042.92

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Solution

The fourth proportional to 721,338.36, 995,476.28 and 399,042.92 is: 550,695.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,338.36 : 995,476.28 = 399,042.92 : x
  2. Step 2: Convert to fraction form
    721,338.36/995,476.28 = 399,042.92/x
  3. Step 3: Cross multiply
    721,338.36x = 995,476.28 × 399,042.92
  4. Step 4: Simplify right side
    721,338.36x = 397,237,761,561.94
  5. Step 5: Solve for x
    x = 397,237,761,561.94/721,338.36
  6. Step 6: Final answer
    x = 550,695.46

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Half scale
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Double scale
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Similar ratio
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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.