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Finding the Fourth Proportional to 18,109.68, 27,173.88 and 7,718.64

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Solution

The fourth proportional to 18,109.68, 27,173.88 and 7,718.64 is: 11,581.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,109.68 : 27,173.88 = 7,718.64 : x
  2. Step 2: Convert to fraction form
    18,109.68/27,173.88 = 7,718.64/x
  3. Step 3: Cross multiply
    18,109.68x = 27,173.88 × 7,718.64
  4. Step 4: Simplify right side
    18,109.68x = 209,745,397.12
  5. Step 5: Solve for x
    x = 209,745,397.12/18,109.68
  6. Step 6: Final answer
    x = 11,581.95

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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.