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Finding the Fourth Proportional to 13,131.70, 18,100.31 and 9,145.89

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Solution

The fourth proportional to 13,131.70, 18,100.31 and 9,145.89 is: 12,606.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,131.70 : 18,100.31 = 9,145.89 : x
  2. Step 2: Convert to fraction form
    13,131.70/18,100.31 = 9,145.89/x
  3. Step 3: Cross multiply
    13,131.70x = 18,100.31 × 9,145.89
  4. Step 4: Simplify right side
    13,131.70x = 165,543,398.50
  5. Step 5: Solve for x
    x = 165,543,398.50/13,131.70
  6. Step 6: Final answer
    x = 12,606.40

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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.