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Finding the Fourth Proportional to 21,071.70, 29,076.84 and 11,639.66

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Solution

The fourth proportional to 21,071.70, 29,076.84 and 11,639.66 is: 16,061.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,071.70 : 29,076.84 = 11,639.66 : x
  2. Step 2: Convert to fraction form
    21,071.70/29,076.84 = 11,639.66/x
  3. Step 3: Cross multiply
    21,071.70x = 29,076.84 × 11,639.66
  4. Step 4: Simplify right side
    21,071.70x = 338,444,386.09
  5. Step 5: Solve for x
    x = 338,444,386.09/21,071.70
  6. Step 6: Final answer
    x = 16,061.56

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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.