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Finding the Fourth Proportional to 13,620.40, 18,797.18 and 8,316.24

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Solution

The fourth proportional to 13,620.40, 18,797.18 and 8,316.24 is: 11,477.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.40 : 18,797.18 = 8,316.24 : x
  2. Step 2: Convert to fraction form
    13,620.40/18,797.18 = 8,316.24/x
  3. Step 3: Cross multiply
    13,620.40x = 18,797.18 × 8,316.24
  4. Step 4: Simplify right side
    13,620.40x = 156,321,860.20
  5. Step 5: Solve for x
    x = 156,321,860.20/13,620.40
  6. Step 6: Final answer
    x = 11,477.04

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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.