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Finding the Fourth Proportional to 13,617.90, 18,795.63 and 8,311.58

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Solution

The fourth proportional to 13,617.90, 18,795.63 and 8,311.58 is: 11,471.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,617.90 : 18,795.63 = 8,311.58 : x
  2. Step 2: Convert to fraction form
    13,617.90/18,795.63 = 8,311.58/x
  3. Step 3: Cross multiply
    13,617.90x = 18,795.63 × 8,311.58
  4. Step 4: Simplify right side
    13,617.90x = 156,221,382.40
  5. Step 5: Solve for x
    x = 156,221,382.40/13,617.90
  6. Step 6: Final answer
    x = 11,471.77

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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.