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Finding the Fourth Proportional to 15,726.99, 21,711.29 and 12,133.88

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Solution

The fourth proportional to 15,726.99, 21,711.29 and 12,133.88 is: 16,750.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,726.99 : 21,711.29 = 12,133.88 : x
  2. Step 2: Convert to fraction form
    15,726.99/21,711.29 = 12,133.88/x
  3. Step 3: Cross multiply
    15,726.99x = 21,711.29 × 12,133.88
  4. Step 4: Simplify right side
    15,726.99x = 263,442,122.15
  5. Step 5: Solve for x
    x = 263,442,122.15/15,726.99
  6. Step 6: Final answer
    x = 16,750.95

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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.