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Finding the Fourth Proportional to 665,805.20, 998,959.20 and 399,751.18

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Solution

The fourth proportional to 665,805.20, 998,959.20 and 399,751.18 is: 599,777.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,805.20 : 998,959.20 = 399,751.18 : x
  2. Step 2: Convert to fraction form
    665,805.20/998,959.20 = 399,751.18/x
  3. Step 3: Cross multiply
    665,805.20x = 998,959.20 × 399,751.18
  4. Step 4: Simplify right side
    665,805.20x = 399,335,118,971.86
  5. Step 5: Solve for x
    x = 399,335,118,971.86/665,805.20
  6. Step 6: Final answer
    x = 599,777.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.