Home / 18,954.20-28,430.91-8,421.36

Finding the Fourth Proportional to 18,954.20, 28,430.91 and 8,421.36

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Solution

The fourth proportional to 18,954.20, 28,430.91 and 8,421.36 is: 12,631.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.20 : 28,430.91 = 8,421.36 : x
  2. Step 2: Convert to fraction form
    18,954.20/28,430.91 = 8,421.36/x
  3. Step 3: Cross multiply
    18,954.20x = 28,430.91 × 8,421.36
  4. Step 4: Simplify right side
    18,954.20x = 239,427,003.27
  5. Step 5: Solve for x
    x = 239,427,003.27/18,954.20
  6. Step 6: Final answer
    x = 12,631.87

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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.