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Finding the Fourth Proportional to 138,865.80, 208,298.70 and 126,618.60

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Solution

The fourth proportional to 138,865.80, 208,298.70 and 126,618.60 is: 189,927.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,865.80 : 208,298.70 = 126,618.60 : x
  2. Step 2: Convert to fraction form
    138,865.80/208,298.70 = 126,618.60/x
  3. Step 3: Cross multiply
    138,865.80x = 208,298.70 × 126,618.60
  4. Step 4: Simplify right side
    138,865.80x = 26,374,489,775.82
  5. Step 5: Solve for x
    x = 26,374,489,775.82/138,865.80
  6. Step 6: Final answer
    x = 189,927.90

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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.