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Finding the Fourth Proportional to 81,301.90, 121,989.30 and 36,905.80

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Solution

The fourth proportional to 81,301.90, 121,989.30 and 36,905.80 is: 55,375.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,301.90 : 121,989.30 = 36,905.80 : x
  2. Step 2: Convert to fraction form
    81,301.90/121,989.30 = 36,905.80/x
  3. Step 3: Cross multiply
    81,301.90x = 121,989.30 × 36,905.80
  4. Step 4: Simplify right side
    81,301.90x = 4,502,112,707.94
  5. Step 5: Solve for x
    x = 4,502,112,707.94/81,301.90
  6. Step 6: Final answer
    x = 55,375.25

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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.