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Finding the Fourth Proportional to 721,668.42, 995,861.25 and 399,359.70

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Solution

The fourth proportional to 721,668.42, 995,861.25 and 399,359.70 is: 551,093.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,668.42 : 995,861.25 = 399,359.70 : x
  2. Step 2: Convert to fraction form
    721,668.42/995,861.25 = 399,359.70/x
  3. Step 3: Cross multiply
    721,668.42x = 995,861.25 × 399,359.70
  4. Step 4: Simplify right side
    721,668.42x = 397,706,850,041.63
  5. Step 5: Solve for x
    x = 397,706,850,041.63/721,668.42
  6. Step 6: Final answer
    x = 551,093.60

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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.