Home / 21,131.20-29,158-11,699.74

Finding the Fourth Proportional to 21,131.20, 29,158 and 11,699.74

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Solution

The fourth proportional to 21,131.20, 29,158 and 11,699.74 is: 16,143.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,131.20 : 29,158 = 11,699.74 : x
  2. Step 2: Convert to fraction form
    21,131.20/29,158 = 11,699.74/x
  3. Step 3: Cross multiply
    21,131.20x = 29,158 × 11,699.74
  4. Step 4: Simplify right side
    21,131.20x = 341,141,018.92
  5. Step 5: Solve for x
    x = 341,141,018.92/21,131.20
  6. Step 6: Final answer
    x = 16,143.95

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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.