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Finding the Fourth Proportional to 13,781.46, 20,664.60 and 4,291.21

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Solution

The fourth proportional to 13,781.46, 20,664.60 and 4,291.21 is: 6,434.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.46 : 20,664.60 = 4,291.21 : x
  2. Step 2: Convert to fraction form
    13,781.46/20,664.60 = 4,291.21/x
  3. Step 3: Cross multiply
    13,781.46x = 20,664.60 × 4,291.21
  4. Step 4: Simplify right side
    13,781.46x = 88,676,138.17
  5. Step 5: Solve for x
    x = 88,676,138.17/13,781.46
  6. Step 6: Final answer
    x = 6,434.45

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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.