Home / 21,899.08-30,255.06-20,820.16

Finding the Fourth Proportional to 21,899.08, 30,255.06 and 20,820.16

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Solution

The fourth proportional to 21,899.08, 30,255.06 and 20,820.16 is: 28,764.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.08 : 30,255.06 = 20,820.16 : x
  2. Step 2: Convert to fraction form
    21,899.08/30,255.06 = 20,820.16/x
  3. Step 3: Cross multiply
    21,899.08x = 30,255.06 × 20,820.16
  4. Step 4: Simplify right side
    21,899.08x = 629,915,190.01
  5. Step 5: Solve for x
    x = 629,915,190.01/21,899.08
  6. Step 6: Final answer
    x = 28,764.46

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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.