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Finding the Fourth Proportional to 31,807.35, 43,879.11 and 21,749.88

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Solution

The fourth proportional to 31,807.35, 43,879.11 and 21,749.88 is: 30,004.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,807.35 : 43,879.11 = 21,749.88 : x
  2. Step 2: Convert to fraction form
    31,807.35/43,879.11 = 21,749.88/x
  3. Step 3: Cross multiply
    31,807.35x = 43,879.11 × 21,749.88
  4. Step 4: Simplify right side
    31,807.35x = 954,365,377.01
  5. Step 5: Solve for x
    x = 954,365,377.01/31,807.35
  6. Step 6: Final answer
    x = 30,004.55

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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.