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Finding the Fourth Proportional to 721,885.44, 996,189.82 and 399,588.60

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Solution

The fourth proportional to 721,885.44, 996,189.82 and 399,588.60 is: 551,425.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,885.44 : 996,189.82 = 399,588.60 : x
  2. Step 2: Convert to fraction form
    721,885.44/996,189.82 = 399,588.60/x
  3. Step 3: Cross multiply
    721,885.44x = 996,189.82 × 399,588.60
  4. Step 4: Simplify right side
    721,885.44x = 398,066,094,509.08
  5. Step 5: Solve for x
    x = 398,066,094,509.08/721,885.44
  6. Step 6: Final answer
    x = 551,425.58

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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.