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Finding the Fourth Proportional to 13,361.76, 18,436.68 and 8,645.40

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Solution

The fourth proportional to 13,361.76, 18,436.68 and 8,645.40 is: 11,929.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,361.76 : 18,436.68 = 8,645.40 : x
  2. Step 2: Convert to fraction form
    13,361.76/18,436.68 = 8,645.40/x
  3. Step 3: Cross multiply
    13,361.76x = 18,436.68 × 8,645.40
  4. Step 4: Simplify right side
    13,361.76x = 159,392,473.27
  5. Step 5: Solve for x
    x = 159,392,473.27/13,361.76
  6. Step 6: Final answer
    x = 11,929.00

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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.