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Finding the Fourth Proportional to 18,991.32, 28,493.06 and 9,131.32

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Solution

The fourth proportional to 18,991.32, 28,493.06 and 9,131.32 is: 13,699.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.32 : 28,493.06 = 9,131.32 : x
  2. Step 2: Convert to fraction form
    18,991.32/28,493.06 = 9,131.32/x
  3. Step 3: Cross multiply
    18,991.32x = 28,493.06 × 9,131.32
  4. Step 4: Simplify right side
    18,991.32x = 260,179,248.64
  5. Step 5: Solve for x
    x = 260,179,248.64/18,991.32
  6. Step 6: Final answer
    x = 13,699.90

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.