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Finding the Fourth Proportional to 57,220.99, 78,965.91 and 31,728.43

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Solution

The fourth proportional to 57,220.99, 78,965.91 and 31,728.43 is: 43,785.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,220.99 : 78,965.91 = 31,728.43 : x
  2. Step 2: Convert to fraction form
    57,220.99/78,965.91 = 31,728.43/x
  3. Step 3: Cross multiply
    57,220.99x = 78,965.91 × 31,728.43
  4. Step 4: Simplify right side
    57,220.99x = 2,505,463,952.99
  5. Step 5: Solve for x
    x = 2,505,463,952.99/57,220.99
  6. Step 6: Final answer
    x = 43,785.75

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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.