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Finding the Fourth Proportional to 3,213.06, 4,819.60 and 991.86

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Solution

The fourth proportional to 3,213.06, 4,819.60 and 991.86 is: 1,487.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,213.06 : 4,819.60 = 991.86 : x
  2. Step 2: Convert to fraction form
    3,213.06/4,819.60 = 991.86/x
  3. Step 3: Cross multiply
    3,213.06x = 4,819.60 × 991.86
  4. Step 4: Simplify right side
    3,213.06x = 4,780,368.46
  5. Step 5: Solve for x
    x = 4,780,368.46/3,213.06
  6. Step 6: Final answer
    x = 1,487.79

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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.