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Finding the Fourth Proportional to 343,893.20, 515,912.70 and 103,987.40

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Solution

The fourth proportional to 343,893.20, 515,912.70 and 103,987.40 is: 156,003.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,893.20 : 515,912.70 = 103,987.40 : x
  2. Step 2: Convert to fraction form
    343,893.20/515,912.70 = 103,987.40/x
  3. Step 3: Cross multiply
    343,893.20x = 515,912.70 × 103,987.40
  4. Step 4: Simplify right side
    343,893.20x = 53,648,420,299.98
  5. Step 5: Solve for x
    x = 53,648,420,299.98/343,893.20
  6. Step 6: Final answer
    x = 156,003.14

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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.