Home / 20,921.36-28,871.36-11,361.44

Finding the Fourth Proportional to 20,921.36, 28,871.36 and 11,361.44

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Solution

The fourth proportional to 20,921.36, 28,871.36 and 11,361.44 is: 15,678.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.36 : 28,871.36 = 11,361.44 : x
  2. Step 2: Convert to fraction form
    20,921.36/28,871.36 = 11,361.44/x
  3. Step 3: Cross multiply
    20,921.36x = 28,871.36 × 11,361.44
  4. Step 4: Simplify right side
    20,921.36x = 328,020,224.36
  5. Step 5: Solve for x
    x = 328,020,224.36/20,921.36
  6. Step 6: Final answer
    x = 15,678.72

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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.