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Finding the Fourth Proportional to 68,290.62, 102,432.26 and 20,905.72

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Solution

The fourth proportional to 68,290.62, 102,432.26 and 20,905.72 is: 31,357.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,290.62 : 102,432.26 = 20,905.72 : x
  2. Step 2: Convert to fraction form
    68,290.62/102,432.26 = 20,905.72/x
  3. Step 3: Cross multiply
    68,290.62x = 102,432.26 × 20,905.72
  4. Step 4: Simplify right side
    68,290.62x = 2,141,420,146.53
  5. Step 5: Solve for x
    x = 2,141,420,146.53/68,290.62
  6. Step 6: Final answer
    x = 31,357.46

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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.