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Finding the Fourth Proportional to 21,990.72, 30,346.98 and 12,559.26

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Solution

The fourth proportional to 21,990.72, 30,346.98 and 12,559.26 is: 17,331.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.72 : 30,346.98 = 12,559.26 : x
  2. Step 2: Convert to fraction form
    21,990.72/30,346.98 = 12,559.26/x
  3. Step 3: Cross multiply
    21,990.72x = 30,346.98 × 12,559.26
  4. Step 4: Simplify right side
    21,990.72x = 381,135,612.03
  5. Step 5: Solve for x
    x = 381,135,612.03/21,990.72
  6. Step 6: Final answer
    x = 17,331.66

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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.