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Finding the Fourth Proportional to 3,179.69, 4,769.82 and 839.67

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Solution

The fourth proportional to 3,179.69, 4,769.82 and 839.67 is: 1,259.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.69 : 4,769.82 = 839.67 : x
  2. Step 2: Convert to fraction form
    3,179.69/4,769.82 = 839.67/x
  3. Step 3: Cross multiply
    3,179.69x = 4,769.82 × 839.67
  4. Step 4: Simplify right side
    3,179.69x = 4,005,060.41
  5. Step 5: Solve for x
    x = 4,005,060.41/3,179.69
  6. Step 6: Final answer
    x = 1,259.57

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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.