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Finding the Fourth Proportional to 131,511.60, 197,121.60 and 72,389.70

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Solution

The fourth proportional to 131,511.60, 197,121.60 and 72,389.70 is: 108,504.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,511.60 : 197,121.60 = 72,389.70 : x
  2. Step 2: Convert to fraction form
    131,511.60/197,121.60 = 72,389.70/x
  3. Step 3: Cross multiply
    131,511.60x = 197,121.60 × 72,389.70
  4. Step 4: Simplify right side
    131,511.60x = 14,269,573,487.52
  5. Step 5: Solve for x
    x = 14,269,573,487.52/131,511.60
  6. Step 6: Final answer
    x = 108,504.30

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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.