Home / 20,921.44-28,871.50-11,361.25

Finding the Fourth Proportional to 20,921.44, 28,871.50 and 11,361.25

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Solution

The fourth proportional to 20,921.44, 28,871.50 and 11,361.25 is: 15,678.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.44 : 28,871.50 = 11,361.25 : x
  2. Step 2: Convert to fraction form
    20,921.44/28,871.50 = 11,361.25/x
  3. Step 3: Cross multiply
    20,921.44x = 28,871.50 × 11,361.25
  4. Step 4: Simplify right side
    20,921.44x = 328,016,329.38
  5. Step 5: Solve for x
    x = 328,016,329.38/20,921.44
  6. Step 6: Final answer
    x = 15,678.48

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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.