Home / 20,911.84-28,857.90-11,480.20

Finding the Fourth Proportional to 20,911.84, 28,857.90 and 11,480.20

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Solution

The fourth proportional to 20,911.84, 28,857.90 and 11,480.20 is: 15,842.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.84 : 28,857.90 = 11,480.20 : x
  2. Step 2: Convert to fraction form
    20,911.84/28,857.90 = 11,480.20/x
  3. Step 3: Cross multiply
    20,911.84x = 28,857.90 × 11,480.20
  4. Step 4: Simplify right side
    20,911.84x = 331,294,463.58
  5. Step 5: Solve for x
    x = 331,294,463.58/20,911.84
  6. Step 6: Final answer
    x = 15,842.43

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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.