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Finding the Fourth Proportional to 138,990.90, 191,828.07 and 88,008.39

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Solution

The fourth proportional to 138,990.90, 191,828.07 and 88,008.39 is: 121,464.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,990.90 : 191,828.07 = 88,008.39 : x
  2. Step 2: Convert to fraction form
    138,990.90/191,828.07 = 88,008.39/x
  3. Step 3: Cross multiply
    138,990.90x = 191,828.07 × 88,008.39
  4. Step 4: Simplify right side
    138,990.90x = 16,882,478,198.33
  5. Step 5: Solve for x
    x = 16,882,478,198.33/138,990.90
  6. Step 6: Final answer
    x = 121,464.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.