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Finding the Fourth Proportional to 21,564.90, 29,757.93 and 12,131.64

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Solution

The fourth proportional to 21,564.90, 29,757.93 and 12,131.64 is: 16,740.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,564.90 : 29,757.93 = 12,131.64 : x
  2. Step 2: Convert to fraction form
    21,564.90/29,757.93 = 12,131.64/x
  3. Step 3: Cross multiply
    21,564.90x = 29,757.93 × 12,131.64
  4. Step 4: Simplify right side
    21,564.90x = 361,012,493.91
  5. Step 5: Solve for x
    x = 361,012,493.91/21,564.90
  6. Step 6: Final answer
    x = 16,740.75

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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.