Home / 18,931.20-28,375.68-8,403.36

Finding the Fourth Proportional to 18,931.20, 28,375.68 and 8,403.36

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Solution

The fourth proportional to 18,931.20, 28,375.68 and 8,403.36 is: 12,595.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.20 : 28,375.68 = 8,403.36 : x
  2. Step 2: Convert to fraction form
    18,931.20/28,375.68 = 8,403.36/x
  3. Step 3: Cross multiply
    18,931.20x = 28,375.68 × 8,403.36
  4. Step 4: Simplify right side
    18,931.20x = 238,451,054.28
  5. Step 5: Solve for x
    x = 238,451,054.28/18,931.20
  6. Step 6: Final answer
    x = 12,595.67

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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.