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Finding the Fourth Proportional to 721,660.20, 995,866.50 and 399,383.88

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Solution

The fourth proportional to 721,660.20, 995,866.50 and 399,383.88 is: 551,136.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,660.20 : 995,866.50 = 399,383.88 : x
  2. Step 2: Convert to fraction form
    721,660.20/995,866.50 = 399,383.88/x
  3. Step 3: Cross multiply
    721,660.20x = 995,866.50 × 399,383.88
  4. Step 4: Simplify right side
    721,660.20x = 397,733,026,732.02
  5. Step 5: Solve for x
    x = 397,733,026,732.02/721,660.20
  6. Step 6: Final answer
    x = 551,136.15

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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.