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Finding the Fourth Proportional to 138,769.60, 208,251.60 and 88,970.80

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Solution

The fourth proportional to 138,769.60, 208,251.60 and 88,970.80 is: 133,518.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,769.60 : 208,251.60 = 88,970.80 : x
  2. Step 2: Convert to fraction form
    138,769.60/208,251.60 = 88,970.80/x
  3. Step 3: Cross multiply
    138,769.60x = 208,251.60 × 88,970.80
  4. Step 4: Simplify right side
    138,769.60x = 18,528,311,453.28
  5. Step 5: Solve for x
    x = 18,528,311,453.28/138,769.60
  6. Step 6: Final answer
    x = 133,518.52

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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.