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Finding the Fourth Proportional to 31,325.72, 43,217.60 and 19,995.64

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Solution

The fourth proportional to 31,325.72, 43,217.60 and 19,995.64 is: 27,586.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,325.72 : 43,217.60 = 19,995.64 : x
  2. Step 2: Convert to fraction form
    31,325.72/43,217.60 = 19,995.64/x
  3. Step 3: Cross multiply
    31,325.72x = 43,217.60 × 19,995.64
  4. Step 4: Simplify right side
    31,325.72x = 864,163,571.26
  5. Step 5: Solve for x
    x = 864,163,571.26/31,325.72
  6. Step 6: Final answer
    x = 27,586.39

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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.