Home / 20,116.90-30,186.15-8,431.30

Finding the Fourth Proportional to 20,116.90, 30,186.15 and 8,431.30

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Solution

The fourth proportional to 20,116.90, 30,186.15 and 8,431.30 is: 12,651.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,116.90 : 30,186.15 = 8,431.30 : x
  2. Step 2: Convert to fraction form
    20,116.90/30,186.15 = 8,431.30/x
  3. Step 3: Cross multiply
    20,116.90x = 30,186.15 × 8,431.30
  4. Step 4: Simplify right side
    20,116.90x = 254,508,486.50
  5. Step 5: Solve for x
    x = 254,508,486.50/20,116.90
  6. Step 6: Final answer
    x = 12,651.48

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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.