Home / 28,440-39,247.20-15,864.75

Finding the Fourth Proportional to 28,440, 39,247.20 and 15,864.75

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Solution

The fourth proportional to 28,440, 39,247.20 and 15,864.75 is: 21,893.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,440 : 39,247.20 = 15,864.75 : x
  2. Step 2: Convert to fraction form
    28,440/39,247.20 = 15,864.75/x
  3. Step 3: Cross multiply
    28,440x = 39,247.20 × 15,864.75
  4. Step 4: Simplify right side
    28,440x = 622,647,016.20
  5. Step 5: Solve for x
    x = 622,647,016.20/28,440
  6. Step 6: Final answer
    x = 21,893.36

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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.