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Finding the Fourth Proportional to 18,813.90, 28,226.70 and 7,721.50

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Solution

The fourth proportional to 18,813.90, 28,226.70 and 7,721.50 is: 11,584.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.90 : 28,226.70 = 7,721.50 : x
  2. Step 2: Convert to fraction form
    18,813.90/28,226.70 = 7,721.50/x
  3. Step 3: Cross multiply
    18,813.90x = 28,226.70 × 7,721.50
  4. Step 4: Simplify right side
    18,813.90x = 217,952,464.05
  5. Step 5: Solve for x
    x = 217,952,464.05/18,813.90
  6. Step 6: Final answer
    x = 11,584.65

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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.