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Finding the Fourth Proportional to 15,185.57, 20,955.94 and 8,379.65

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Solution

The fourth proportional to 15,185.57, 20,955.94 and 8,379.65 is: 11,563.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,185.57 : 20,955.94 = 8,379.65 : x
  2. Step 2: Convert to fraction form
    15,185.57/20,955.94 = 8,379.65/x
  3. Step 3: Cross multiply
    15,185.57x = 20,955.94 × 8,379.65
  4. Step 4: Simplify right side
    15,185.57x = 175,603,442.62
  5. Step 5: Solve for x
    x = 175,603,442.62/15,185.57
  6. Step 6: Final answer
    x = 11,563.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.