Home / 20,736.90-31,109.40-8,254.80

Finding the Fourth Proportional to 20,736.90, 31,109.40 and 8,254.80

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Solution

The fourth proportional to 20,736.90, 31,109.40 and 8,254.80 is: 12,383.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,736.90 : 31,109.40 = 8,254.80 : x
  2. Step 2: Convert to fraction form
    20,736.90/31,109.40 = 8,254.80/x
  3. Step 3: Cross multiply
    20,736.90x = 31,109.40 × 8,254.80
  4. Step 4: Simplify right side
    20,736.90x = 256,801,875.12
  5. Step 5: Solve for x
    x = 256,801,875.12/20,736.90
  6. Step 6: Final answer
    x = 12,383.81

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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.