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Finding the Fourth Proportional to 18,815.69, 28,181.90 and 7,688.62

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Solution

The fourth proportional to 18,815.69, 28,181.90 and 7,688.62 is: 11,515.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.69 : 28,181.90 = 7,688.62 : x
  2. Step 2: Convert to fraction form
    18,815.69/28,181.90 = 7,688.62/x
  3. Step 3: Cross multiply
    18,815.69x = 28,181.90 × 7,688.62
  4. Step 4: Simplify right side
    18,815.69x = 216,679,919.98
  5. Step 5: Solve for x
    x = 216,679,919.98/18,815.69
  6. Step 6: Final answer
    x = 11,515.92

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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.