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Finding the Fourth Proportional to 18,811.40, 28,217.10 and 7,123.10

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Solution

The fourth proportional to 18,811.40, 28,217.10 and 7,123.10 is: 10,684.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.40 : 28,217.10 = 7,123.10 : x
  2. Step 2: Convert to fraction form
    18,811.40/28,217.10 = 7,123.10/x
  3. Step 3: Cross multiply
    18,811.40x = 28,217.10 × 7,123.10
  4. Step 4: Simplify right side
    18,811.40x = 200,993,225.01
  5. Step 5: Solve for x
    x = 200,993,225.01/18,811.40
  6. Step 6: Final answer
    x = 10,684.65

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Similar ratio
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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.