Home / 20,690.35-31,008.24-8,203.57

Finding the Fourth Proportional to 20,690.35, 31,008.24 and 8,203.57

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Solution

The fourth proportional to 20,690.35, 31,008.24 and 8,203.57 is: 12,294.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.35 : 31,008.24 = 8,203.57 : x
  2. Step 2: Convert to fraction form
    20,690.35/31,008.24 = 8,203.57/x
  3. Step 3: Cross multiply
    20,690.35x = 31,008.24 × 8,203.57
  4. Step 4: Simplify right side
    20,690.35x = 254,378,189.90
  5. Step 5: Solve for x
    x = 254,378,189.90/20,690.35
  6. Step 6: Final answer
    x = 12,294.53

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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.