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Finding the Fourth Proportional to 18,817.62, 28,225.54 and 7,721.56

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Solution

The fourth proportional to 18,817.62, 28,225.54 and 7,721.56 is: 11,581.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,817.62 : 28,225.54 = 7,721.56 : x
  2. Step 2: Convert to fraction form
    18,817.62/28,225.54 = 7,721.56/x
  3. Step 3: Cross multiply
    18,817.62x = 28,225.54 × 7,721.56
  4. Step 4: Simplify right side
    18,817.62x = 217,945,200.64
  5. Step 5: Solve for x
    x = 217,945,200.64/18,817.62
  6. Step 6: Final answer
    x = 11,581.97

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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.