Home / 18,920.45-28,380.60-5,772.78

Finding the Fourth Proportional to 18,920.45, 28,380.60 and 5,772.78

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Solution

The fourth proportional to 18,920.45, 28,380.60 and 5,772.78 is: 8,659.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920.45 : 28,380.60 = 5,772.78 : x
  2. Step 2: Convert to fraction form
    18,920.45/28,380.60 = 5,772.78/x
  3. Step 3: Cross multiply
    18,920.45x = 28,380.60 × 5,772.78
  4. Step 4: Simplify right side
    18,920.45x = 163,834,960.07
  5. Step 5: Solve for x
    x = 163,834,960.07/18,920.45
  6. Step 6: Final answer
    x = 8,659.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.