Home / 20,921.52-28,871.72-11,361.41

Finding the Fourth Proportional to 20,921.52, 28,871.72 and 11,361.41

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Solution

The fourth proportional to 20,921.52, 28,871.72 and 11,361.41 is: 15,678.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.52 : 28,871.72 = 11,361.41 : x
  2. Step 2: Convert to fraction form
    20,921.52/28,871.72 = 11,361.41/x
  3. Step 3: Cross multiply
    20,921.52x = 28,871.72 × 11,361.41
  4. Step 4: Simplify right side
    20,921.52x = 328,023,461.94
  5. Step 5: Solve for x
    x = 328,023,461.94/20,921.52
  6. Step 6: Final answer
    x = 15,678.76

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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.