Home / 20,393.68-28,136.20-11,439.92

Finding the Fourth Proportional to 20,393.68, 28,136.20 and 11,439.92

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Solution

The fourth proportional to 20,393.68, 28,136.20 and 11,439.92 is: 15,783.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,393.68 : 28,136.20 = 11,439.92 : x
  2. Step 2: Convert to fraction form
    20,393.68/28,136.20 = 11,439.92/x
  3. Step 3: Cross multiply
    20,393.68x = 28,136.20 × 11,439.92
  4. Step 4: Simplify right side
    20,393.68x = 321,875,877.10
  5. Step 5: Solve for x
    x = 321,875,877.10/20,393.68
  6. Step 6: Final answer
    x = 15,783.12

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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.