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Finding the Fourth Proportional to 31,068.72, 42,861.19 and 20,993.48

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Solution

The fourth proportional to 31,068.72, 42,861.19 and 20,993.48 is: 28,961.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,068.72 : 42,861.19 = 20,993.48 : x
  2. Step 2: Convert to fraction form
    31,068.72/42,861.19 = 20,993.48/x
  3. Step 3: Cross multiply
    31,068.72x = 42,861.19 × 20,993.48
  4. Step 4: Simplify right side
    31,068.72x = 899,805,709.44
  5. Step 5: Solve for x
    x = 899,805,709.44/31,068.72
  6. Step 6: Final answer
    x = 28,961.79

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.