Home / 20,871.55-28,801.78-11,439.91

Finding the Fourth Proportional to 20,871.55, 28,801.78 and 11,439.91

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Solution

The fourth proportional to 20,871.55, 28,801.78 and 11,439.91 is: 15,786.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.55 : 28,801.78 = 11,439.91 : x
  2. Step 2: Convert to fraction form
    20,871.55/28,801.78 = 11,439.91/x
  3. Step 3: Cross multiply
    20,871.55x = 28,801.78 × 11,439.91
  4. Step 4: Simplify right side
    20,871.55x = 329,489,771.04
  5. Step 5: Solve for x
    x = 329,489,771.04/20,871.55
  6. Step 6: Final answer
    x = 15,786.55

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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.