Home / 20,394.40-28,142.72-11,440.80

Finding the Fourth Proportional to 20,394.40, 28,142.72 and 11,440.80

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Solution

The fourth proportional to 20,394.40, 28,142.72 and 11,440.80 is: 15,787.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,394.40 : 28,142.72 = 11,440.80 : x
  2. Step 2: Convert to fraction form
    20,394.40/28,142.72 = 11,440.80/x
  3. Step 3: Cross multiply
    20,394.40x = 28,142.72 × 11,440.80
  4. Step 4: Simplify right side
    20,394.40x = 321,975,230.98
  5. Step 5: Solve for x
    x = 321,975,230.98/20,394.40
  6. Step 6: Final answer
    x = 15,787.43

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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.