Home / 20,772.28-28,665.78-13,320.28

Finding the Fourth Proportional to 20,772.28, 28,665.78 and 13,320.28

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Solution

The fourth proportional to 20,772.28, 28,665.78 and 13,320.28 is: 18,382.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.28 : 28,665.78 = 13,320.28 : x
  2. Step 2: Convert to fraction form
    20,772.28/28,665.78 = 13,320.28/x
  3. Step 3: Cross multiply
    20,772.28x = 28,665.78 × 13,320.28
  4. Step 4: Simplify right side
    20,772.28x = 381,836,216.02
  5. Step 5: Solve for x
    x = 381,836,216.02/20,772.28
  6. Step 6: Final answer
    x = 18,382.01

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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.