Home / 20,885.75-31,331.60-6,842.78

Finding the Fourth Proportional to 20,885.75, 31,331.60 and 6,842.78

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Solution

The fourth proportional to 20,885.75, 31,331.60 and 6,842.78 is: 10,265.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.75 : 31,331.60 = 6,842.78 : x
  2. Step 2: Convert to fraction form
    20,885.75/31,331.60 = 6,842.78/x
  3. Step 3: Cross multiply
    20,885.75x = 31,331.60 × 6,842.78
  4. Step 4: Simplify right side
    20,885.75x = 214,395,106.30
  5. Step 5: Solve for x
    x = 214,395,106.30/20,885.75
  6. Step 6: Final answer
    x = 10,265.14

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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.