Home / 20,961.30-31,478.40-11,119.80

Finding the Fourth Proportional to 20,961.30, 31,478.40 and 11,119.80

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Solution

The fourth proportional to 20,961.30, 31,478.40 and 11,119.80 is: 16,699.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.30 : 31,478.40 = 11,119.80 : x
  2. Step 2: Convert to fraction form
    20,961.30/31,478.40 = 11,119.80/x
  3. Step 3: Cross multiply
    20,961.30x = 31,478.40 × 11,119.80
  4. Step 4: Simplify right side
    20,961.30x = 350,033,512.32
  5. Step 5: Solve for x
    x = 350,033,512.32/20,961.30
  6. Step 6: Final answer
    x = 16,699.04

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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.