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Finding the Fourth Proportional to 6,989.80, 10,492.80 and 4,219.60

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Solution

The fourth proportional to 6,989.80, 10,492.80 and 4,219.60 is: 6,334.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,989.80 : 10,492.80 = 4,219.60 : x
  2. Step 2: Convert to fraction form
    6,989.80/10,492.80 = 4,219.60/x
  3. Step 3: Cross multiply
    6,989.80x = 10,492.80 × 4,219.60
  4. Step 4: Simplify right side
    6,989.80x = 44,275,418.88
  5. Step 5: Solve for x
    x = 44,275,418.88/6,989.80
  6. Step 6: Final answer
    x = 6,334.29

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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.