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Finding the Fourth Proportional to 18,806.17, 25,942.21 and 11,987.53

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Solution

The fourth proportional to 18,806.17, 25,942.21 and 11,987.53 is: 16,536.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,806.17 : 25,942.21 = 11,987.53 : x
  2. Step 2: Convert to fraction form
    18,806.17/25,942.21 = 11,987.53/x
  3. Step 3: Cross multiply
    18,806.17x = 25,942.21 × 11,987.53
  4. Step 4: Simplify right side
    18,806.17x = 310,983,020.64
  5. Step 5: Solve for x
    x = 310,983,020.64/18,806.17
  6. Step 6: Final answer
    x = 16,536.22

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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.