Home / 20,686.80-28,546.32-11,255.16

Finding the Fourth Proportional to 20,686.80, 28,546.32 and 11,255.16

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Solution

The fourth proportional to 20,686.80, 28,546.32 and 11,255.16 is: 15,531.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.80 : 28,546.32 = 11,255.16 : x
  2. Step 2: Convert to fraction form
    20,686.80/28,546.32 = 11,255.16/x
  3. Step 3: Cross multiply
    20,686.80x = 28,546.32 × 11,255.16
  4. Step 4: Simplify right side
    20,686.80x = 321,293,399.01
  5. Step 5: Solve for x
    x = 321,293,399.01/20,686.80
  6. Step 6: Final answer
    x = 15,531.32

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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.