Home / 20,728.26-31,092.12-5,145.75

Finding the Fourth Proportional to 20,728.26, 31,092.12 and 5,145.75

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Solution

The fourth proportional to 20,728.26, 31,092.12 and 5,145.75 is: 7,718.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.26 : 31,092.12 = 5,145.75 : x
  2. Step 2: Convert to fraction form
    20,728.26/31,092.12 = 5,145.75/x
  3. Step 3: Cross multiply
    20,728.26x = 31,092.12 × 5,145.75
  4. Step 4: Simplify right side
    20,728.26x = 159,992,276.49
  5. Step 5: Solve for x
    x = 159,992,276.49/20,728.26
  6. Step 6: Final answer
    x = 7,718.56

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1.5x scale

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.