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Finding the Fourth Proportional to 18,761.63, 28,086.35 and 11,343.65

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Solution

The fourth proportional to 18,761.63, 28,086.35 and 11,343.65 is: 16,981.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.63 : 28,086.35 = 11,343.65 : x
  2. Step 2: Convert to fraction form
    18,761.63/28,086.35 = 11,343.65/x
  3. Step 3: Cross multiply
    18,761.63x = 28,086.35 × 11,343.65
  4. Step 4: Simplify right side
    18,761.63x = 318,601,527.03
  5. Step 5: Solve for x
    x = 318,601,527.03/18,761.63
  6. Step 6: Final answer
    x = 16,981.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.