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Finding the Fourth Proportional to 18,960.90, 28,441.08 and 8,572.65

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Solution

The fourth proportional to 18,960.90, 28,441.08 and 8,572.65 is: 12,858.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.90 : 28,441.08 = 8,572.65 : x
  2. Step 2: Convert to fraction form
    18,960.90/28,441.08 = 8,572.65/x
  3. Step 3: Cross multiply
    18,960.90x = 28,441.08 × 8,572.65
  4. Step 4: Simplify right side
    18,960.90x = 243,815,424.46
  5. Step 5: Solve for x
    x = 243,815,424.46/18,960.90
  6. Step 6: Final answer
    x = 12,858.85

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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.