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Finding the Fourth Proportional to 31,869.42, 43,978.08 and 18,440.90

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Solution

The fourth proportional to 31,869.42, 43,978.08 and 18,440.90 is: 25,447.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,869.42 : 43,978.08 = 18,440.90 : x
  2. Step 2: Convert to fraction form
    31,869.42/43,978.08 = 18,440.90/x
  3. Step 3: Cross multiply
    31,869.42x = 43,978.08 × 18,440.90
  4. Step 4: Simplify right side
    31,869.42x = 810,995,375.47
  5. Step 5: Solve for x
    x = 810,995,375.47/31,869.42
  6. Step 6: Final answer
    x = 25,447.45

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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.