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Finding the Fourth Proportional to 18,991.55, 26,213.90 and 11,036.95

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Solution

The fourth proportional to 18,991.55, 26,213.90 and 11,036.95 is: 15,234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.55 : 26,213.90 = 11,036.95 : x
  2. Step 2: Convert to fraction form
    18,991.55/26,213.90 = 11,036.95/x
  3. Step 3: Cross multiply
    18,991.55x = 26,213.90 × 11,036.95
  4. Step 4: Simplify right side
    18,991.55x = 289,321,382.89
  5. Step 5: Solve for x
    x = 289,321,382.89/18,991.55
  6. Step 6: Final answer
    x = 15,234.21

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1.5x scale

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.