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Finding the Fourth Proportional to 21,687.67, 29,929.71 and 12,256.84

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Solution

The fourth proportional to 21,687.67, 29,929.71 and 12,256.84 is: 16,914.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.67 : 29,929.71 = 12,256.84 : x
  2. Step 2: Convert to fraction form
    21,687.67/29,929.71 = 12,256.84/x
  3. Step 3: Cross multiply
    21,687.67x = 29,929.71 × 12,256.84
  4. Step 4: Simplify right side
    21,687.67x = 366,843,666.72
  5. Step 5: Solve for x
    x = 366,843,666.72/21,687.67
  6. Step 6: Final answer
    x = 16,914.85

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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.