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Finding the Fourth Proportional to 8,813.20, 13,219.80 and 2,969.20

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Solution

The fourth proportional to 8,813.20, 13,219.80 and 2,969.20 is: 4,453.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,813.20 : 13,219.80 = 2,969.20 : x
  2. Step 2: Convert to fraction form
    8,813.20/13,219.80 = 2,969.20/x
  3. Step 3: Cross multiply
    8,813.20x = 13,219.80 × 2,969.20
  4. Step 4: Simplify right side
    8,813.20x = 39,252,230.16
  5. Step 5: Solve for x
    x = 39,252,230.16/8,813.20
  6. Step 6: Final answer
    x = 4,453.80

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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.