Home / 20,287.18-27,987.66-12,728.38

Finding the Fourth Proportional to 20,287.18, 27,987.66 and 12,728.38

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Solution

The fourth proportional to 20,287.18, 27,987.66 and 12,728.38 is: 17,559.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,287.18 : 27,987.66 = 12,728.38 : x
  2. Step 2: Convert to fraction form
    20,287.18/27,987.66 = 12,728.38/x
  3. Step 3: Cross multiply
    20,287.18x = 27,987.66 × 12,728.38
  4. Step 4: Simplify right side
    20,287.18x = 356,237,571.79
  5. Step 5: Solve for x
    x = 356,237,571.79/20,287.18
  6. Step 6: Final answer
    x = 17,559.74

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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.