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Finding the Fourth Proportional to 485,978.89, 728,377.33 and 343,865.11

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Solution

The fourth proportional to 485,978.89, 728,377.33 and 343,865.11 is: 515,379.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,978.89 : 728,377.33 = 343,865.11 : x
  2. Step 2: Convert to fraction form
    485,978.89/728,377.33 = 343,865.11/x
  3. Step 3: Cross multiply
    485,978.89x = 728,377.33 × 343,865.11
  4. Step 4: Simplify right side
    485,978.89x = 250,463,550,701.96
  5. Step 5: Solve for x
    x = 250,463,550,701.96/485,978.89
  6. Step 6: Final answer
    x = 515,379.49

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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.