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Finding the Fourth Proportional to 21,051.99, 29,051.30 and 11,491.56

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Solution

The fourth proportional to 21,051.99, 29,051.30 and 11,491.56 is: 15,858.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.99 : 29,051.30 = 11,491.56 : x
  2. Step 2: Convert to fraction form
    21,051.99/29,051.30 = 11,491.56/x
  3. Step 3: Cross multiply
    21,051.99x = 29,051.30 × 11,491.56
  4. Step 4: Simplify right side
    21,051.99x = 333,844,785.76
  5. Step 5: Solve for x
    x = 333,844,785.76/21,051.99
  6. Step 6: Final answer
    x = 15,858.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.