Home / 20,961.20-31,440.90-7,110.20

Finding the Fourth Proportional to 20,961.20, 31,440.90 and 7,110.20

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Solution

The fourth proportional to 20,961.20, 31,440.90 and 7,110.20 is: 10,664.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.20 : 31,440.90 = 7,110.20 : x
  2. Step 2: Convert to fraction form
    20,961.20/31,440.90 = 7,110.20/x
  3. Step 3: Cross multiply
    20,961.20x = 31,440.90 × 7,110.20
  4. Step 4: Simplify right side
    20,961.20x = 223,551,087.18
  5. Step 5: Solve for x
    x = 223,551,087.18/20,961.20
  6. Step 6: Final answer
    x = 10,664.99

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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.