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Finding the Fourth Proportional to 68,017.31, 102,027.80 and 21,270.19

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Solution

The fourth proportional to 68,017.31, 102,027.80 and 21,270.19 is: 31,905.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,017.31 : 102,027.80 = 21,270.19 : x
  2. Step 2: Convert to fraction form
    68,017.31/102,027.80 = 21,270.19/x
  3. Step 3: Cross multiply
    68,017.31x = 102,027.80 × 21,270.19
  4. Step 4: Simplify right side
    68,017.31x = 2,170,150,329.86
  5. Step 5: Solve for x
    x = 2,170,150,329.86/68,017.31
  6. Step 6: Final answer
    x = 31,905.85

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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.