Home / 20,991.28-28,966.92-13,539.28

Finding the Fourth Proportional to 20,991.28, 28,966.92 and 13,539.28

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Solution

The fourth proportional to 20,991.28, 28,966.92 and 13,539.28 is: 18,683.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.28 : 28,966.92 = 13,539.28 : x
  2. Step 2: Convert to fraction form
    20,991.28/28,966.92 = 13,539.28/x
  3. Step 3: Cross multiply
    20,991.28x = 28,966.92 × 13,539.28
  4. Step 4: Simplify right side
    20,991.28x = 392,191,240.62
  5. Step 5: Solve for x
    x = 392,191,240.62/20,991.28
  6. Step 6: Final answer
    x = 18,683.53

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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.