Home / 81,289.92-121,939.64-31,370.28

Finding the Fourth Proportional to 81,289.92, 121,939.64 and 31,370.28

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Solution

The fourth proportional to 81,289.92, 121,939.64 and 31,370.28 is: 47,057.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,289.92 : 121,939.64 = 31,370.28 : x
  2. Step 2: Convert to fraction form
    81,289.92/121,939.64 = 31,370.28/x
  3. Step 3: Cross multiply
    81,289.92x = 121,939.64 × 31,370.28
  4. Step 4: Simplify right side
    81,289.92x = 3,825,280,649.90
  5. Step 5: Solve for x
    x = 3,825,280,649.90/81,289.92
  6. Step 6: Final answer
    x = 47,057.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.