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Finding the Fourth Proportional to 21,243.59, 29,314.95 and 11,811.95

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Solution

The fourth proportional to 21,243.59, 29,314.95 and 11,811.95 is: 16,299.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,243.59 : 29,314.95 = 11,811.95 : x
  2. Step 2: Convert to fraction form
    21,243.59/29,314.95 = 11,811.95/x
  3. Step 3: Cross multiply
    21,243.59x = 29,314.95 × 11,811.95
  4. Step 4: Simplify right side
    21,243.59x = 346,266,723.65
  5. Step 5: Solve for x
    x = 346,266,723.65/21,243.59
  6. Step 6: Final answer
    x = 16,299.82

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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.