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Finding the Fourth Proportional to 13,415.52, 18,520.08 and 8,382.54

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Solution

The fourth proportional to 13,415.52, 18,520.08 and 8,382.54 is: 11,572.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.52 : 18,520.08 = 8,382.54 : x
  2. Step 2: Convert to fraction form
    13,415.52/18,520.08 = 8,382.54/x
  3. Step 3: Cross multiply
    13,415.52x = 18,520.08 × 8,382.54
  4. Step 4: Simplify right side
    13,415.52x = 155,245,311.40
  5. Step 5: Solve for x
    x = 155,245,311.40/13,415.52
  6. Step 6: Final answer
    x = 11,572.07

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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.