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Finding the Fourth Proportional to 52,172.20, 78,200.70 and 28,815.40

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Solution

The fourth proportional to 52,172.20, 78,200.70 and 28,815.40 is: 43,191.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,172.20 : 78,200.70 = 28,815.40 : x
  2. Step 2: Convert to fraction form
    52,172.20/78,200.70 = 28,815.40/x
  3. Step 3: Cross multiply
    52,172.20x = 78,200.70 × 28,815.40
  4. Step 4: Simplify right side
    52,172.20x = 2,253,384,450.78
  5. Step 5: Solve for x
    x = 2,253,384,450.78/52,172.20
  6. Step 6: Final answer
    x = 43,191.29

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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.