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Finding the Fourth Proportional to 18,930.38, 28,407.71 and 8,542.13

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Solution

The fourth proportional to 18,930.38, 28,407.71 and 8,542.13 is: 12,818.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.38 : 28,407.71 = 8,542.13 : x
  2. Step 2: Convert to fraction form
    18,930.38/28,407.71 = 8,542.13/x
  3. Step 3: Cross multiply
    18,930.38x = 28,407.71 × 8,542.13
  4. Step 4: Simplify right side
    18,930.38x = 242,662,231.14
  5. Step 5: Solve for x
    x = 242,662,231.14/18,930.38
  6. Step 6: Final answer
    x = 12,818.67

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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.