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Finding the Fourth Proportional to 6,991.80, 10,495.80 and 4,221.60

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Solution

The fourth proportional to 6,991.80, 10,495.80 and 4,221.60 is: 6,337.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,991.80 : 10,495.80 = 4,221.60 : x
  2. Step 2: Convert to fraction form
    6,991.80/10,495.80 = 4,221.60/x
  3. Step 3: Cross multiply
    6,991.80x = 10,495.80 × 4,221.60
  4. Step 4: Simplify right side
    6,991.80x = 44,309,069.28
  5. Step 5: Solve for x
    x = 44,309,069.28/6,991.80
  6. Step 6: Final answer
    x = 6,337.29

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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.