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Finding the Fourth Proportional to 73,989.78, 110,999.43 and 21,399.90

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Solution

The fourth proportional to 73,989.78, 110,999.43 and 21,399.90 is: 32,104.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,989.78 : 110,999.43 = 21,399.90 : x
  2. Step 2: Convert to fraction form
    73,989.78/110,999.43 = 21,399.90/x
  3. Step 3: Cross multiply
    73,989.78x = 110,999.43 × 21,399.90
  4. Step 4: Simplify right side
    73,989.78x = 2,375,376,702.06
  5. Step 5: Solve for x
    x = 2,375,376,702.06/73,989.78
  6. Step 6: Final answer
    x = 32,104.12

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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.