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Finding the Fourth Proportional to 18,611.21, 25,686.04 and 11,445.65

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Solution

The fourth proportional to 18,611.21, 25,686.04 and 11,445.65 is: 15,796.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,611.21 : 25,686.04 = 11,445.65 : x
  2. Step 2: Convert to fraction form
    18,611.21/25,686.04 = 11,445.65/x
  3. Step 3: Cross multiply
    18,611.21x = 25,686.04 × 11,445.65
  4. Step 4: Simplify right side
    18,611.21x = 293,993,266.68
  5. Step 5: Solve for x
    x = 293,993,266.68/18,611.21
  6. Step 6: Final answer
    x = 15,796.57

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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.