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Finding the Fourth Proportional to 721,884.94, 996,189.13 and 399,588.10

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Solution

The fourth proportional to 721,884.94, 996,189.13 and 399,588.10 is: 551,424.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,884.94 : 996,189.13 = 399,588.10 : x
  2. Step 2: Convert to fraction form
    721,884.94/996,189.13 = 399,588.10/x
  3. Step 3: Cross multiply
    721,884.94x = 996,189.13 × 399,588.10
  4. Step 4: Simplify right side
    721,884.94x = 398,065,320,698.38
  5. Step 5: Solve for x
    x = 398,065,320,698.38/721,884.94
  6. Step 6: Final answer
    x = 551,424.89

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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.