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Finding the Fourth Proportional to 68,111.93, 102,171.74 and 20,728.57

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Solution

The fourth proportional to 68,111.93, 102,171.74 and 20,728.57 is: 31,094.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,111.93 : 102,171.74 = 20,728.57 : x
  2. Step 2: Convert to fraction form
    68,111.93/102,171.74 = 20,728.57/x
  3. Step 3: Cross multiply
    68,111.93x = 102,171.74 × 20,728.57
  4. Step 4: Simplify right side
    68,111.93x = 2,117,874,064.61
  5. Step 5: Solve for x
    x = 2,117,874,064.61/68,111.93
  6. Step 6: Final answer
    x = 31,094.03

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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.