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Finding the Fourth Proportional to 721,299.80, 995,394.43 and 399,031.68

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Solution

The fourth proportional to 721,299.80, 995,394.43 and 399,031.68 is: 550,664.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,299.80 : 995,394.43 = 399,031.68 : x
  2. Step 2: Convert to fraction form
    721,299.80/995,394.43 = 399,031.68/x
  3. Step 3: Cross multiply
    721,299.80x = 995,394.43 × 399,031.68
  4. Step 4: Simplify right side
    721,299.80x = 397,193,911,665.54
  5. Step 5: Solve for x
    x = 397,193,911,665.54/721,299.80
  6. Step 6: Final answer
    x = 550,664.11

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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.