Home / 20,761.84-31,142.76-5,179.60

Finding the Fourth Proportional to 20,761.84, 31,142.76 and 5,179.60

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Solution

The fourth proportional to 20,761.84, 31,142.76 and 5,179.60 is: 7,769.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.84 : 31,142.76 = 5,179.60 : x
  2. Step 2: Convert to fraction form
    20,761.84/31,142.76 = 5,179.60/x
  3. Step 3: Cross multiply
    20,761.84x = 31,142.76 × 5,179.60
  4. Step 4: Simplify right side
    20,761.84x = 161,307,039.70
  5. Step 5: Solve for x
    x = 161,307,039.70/20,761.84
  6. Step 6: Final answer
    x = 7,769.40

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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.