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Finding the Fourth Proportional to 18,815.72, 28,181.95 and 7,688.65

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Solution

The fourth proportional to 18,815.72, 28,181.95 and 7,688.65 is: 11,515.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.72 : 28,181.95 = 7,688.65 : x
  2. Step 2: Convert to fraction form
    18,815.72/28,181.95 = 7,688.65/x
  3. Step 3: Cross multiply
    18,815.72x = 28,181.95 × 7,688.65
  4. Step 4: Simplify right side
    18,815.72x = 216,681,181.88
  5. Step 5: Solve for x
    x = 216,681,181.88/18,815.72
  6. Step 6: Final answer
    x = 11,515.96

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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.