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Finding the Fourth Proportional to 485,321.40, 727,982.10 and 343,603.80

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Solution

The fourth proportional to 485,321.40, 727,982.10 and 343,603.80 is: 515,405.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,321.40 : 727,982.10 = 343,603.80 : x
  2. Step 2: Convert to fraction form
    485,321.40/727,982.10 = 343,603.80/x
  3. Step 3: Cross multiply
    485,321.40x = 727,982.10 × 343,603.80
  4. Step 4: Simplify right side
    485,321.40x = 250,137,415,891.98
  5. Step 5: Solve for x
    x = 250,137,415,891.98/485,321.40
  6. Step 6: Final answer
    x = 515,405.70

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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.