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Finding the Fourth Proportional to 18,908.68, 28,326.16 and 10,991.74

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Solution

The fourth proportional to 18,908.68, 28,326.16 and 10,991.74 is: 16,466.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,908.68 : 28,326.16 = 10,991.74 : x
  2. Step 2: Convert to fraction form
    18,908.68/28,326.16 = 10,991.74/x
  3. Step 3: Cross multiply
    18,908.68x = 28,326.16 × 10,991.74
  4. Step 4: Simplify right side
    18,908.68x = 311,353,730.96
  5. Step 5: Solve for x
    x = 311,353,730.96/18,908.68
  6. Step 6: Final answer
    x = 16,466.18

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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.