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Finding the Fourth Proportional to 3,819.60, 5,718.60 and 3,430.80

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Solution

The fourth proportional to 3,819.60, 5,718.60 and 3,430.80 is: 5,136.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,819.60 : 5,718.60 = 3,430.80 : x
  2. Step 2: Convert to fraction form
    3,819.60/5,718.60 = 3,430.80/x
  3. Step 3: Cross multiply
    3,819.60x = 5,718.60 × 3,430.80
  4. Step 4: Simplify right side
    3,819.60x = 19,619,372.88
  5. Step 5: Solve for x
    x = 19,619,372.88/3,819.60
  6. Step 6: Final answer
    x = 5,136.50

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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.