Home / 20,921.56-28,871.99-11,361.55

Finding the Fourth Proportional to 20,921.56, 28,871.99 and 11,361.55

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Solution

The fourth proportional to 20,921.56, 28,871.99 and 11,361.55 is: 15,679.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.56 : 28,871.99 = 11,361.55 : x
  2. Step 2: Convert to fraction form
    20,921.56/28,871.99 = 11,361.55/x
  3. Step 3: Cross multiply
    20,921.56x = 28,871.99 × 11,361.55
  4. Step 4: Simplify right side
    20,921.56x = 328,030,548.20
  5. Step 5: Solve for x
    x = 328,030,548.20/20,921.56
  6. Step 6: Final answer
    x = 15,679.07

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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.