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Finding the Fourth Proportional to 68,112.13, 102,172.03 and 20,728.77

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Solution

The fourth proportional to 68,112.13, 102,172.03 and 20,728.77 is: 31,094.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,112.13 : 102,172.03 = 20,728.77 : x
  2. Step 2: Convert to fraction form
    68,112.13/102,172.03 = 20,728.77/x
  3. Step 3: Cross multiply
    68,112.13x = 102,172.03 × 20,728.77
  4. Step 4: Simplify right side
    68,112.13x = 2,117,900,191.94
  5. Step 5: Solve for x
    x = 2,117,900,191.94/68,112.13
  6. Step 6: Final answer
    x = 31,094.32

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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.