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Finding the Fourth Proportional to 138,781.60, 208,269.60 and 88,982.80

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Solution

The fourth proportional to 138,781.60, 208,269.60 and 88,982.80 is: 133,536.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,781.60 : 208,269.60 = 88,982.80 : x
  2. Step 2: Convert to fraction form
    138,781.60/208,269.60 = 88,982.80/x
  3. Step 3: Cross multiply
    138,781.60x = 208,269.60 × 88,982.80
  4. Step 4: Simplify right side
    138,781.60x = 18,532,412,162.88
  5. Step 5: Solve for x
    x = 18,532,412,162.88/138,781.60
  6. Step 6: Final answer
    x = 133,536.52

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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.