Home / 18,813.05-28,217.60-7,720.91

Finding the Fourth Proportional to 18,813.05, 28,217.60 and 7,720.91

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Solution

The fourth proportional to 18,813.05, 28,217.60 and 7,720.91 is: 11,580.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.05 : 28,217.60 = 7,720.91 : x
  2. Step 2: Convert to fraction form
    18,813.05/28,217.60 = 7,720.91/x
  3. Step 3: Cross multiply
    18,813.05x = 28,217.60 × 7,720.91
  4. Step 4: Simplify right side
    18,813.05x = 217,865,511.41
  5. Step 5: Solve for x
    x = 217,865,511.41/18,813.05
  6. Step 6: Final answer
    x = 11,580.55

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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.