Home / 57,142.40-78,856.46-31,991.90

Finding the Fourth Proportional to 57,142.40, 78,856.46 and 31,991.90

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Solution

The fourth proportional to 57,142.40, 78,856.46 and 31,991.90 is: 44,148.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,142.40 : 78,856.46 = 31,991.90 : x
  2. Step 2: Convert to fraction form
    57,142.40/78,856.46 = 31,991.90/x
  3. Step 3: Cross multiply
    57,142.40x = 78,856.46 × 31,991.90
  4. Step 4: Simplify right side
    57,142.40x = 2,522,767,982.67
  5. Step 5: Solve for x
    x = 2,522,767,982.67/57,142.40
  6. Step 6: Final answer
    x = 44,148.79

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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.