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Finding the Fourth Proportional to 3,312.80, 4,969.20 and 2,778.20

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Solution

The fourth proportional to 3,312.80, 4,969.20 and 2,778.20 is: 4,167.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,312.80 : 4,969.20 = 2,778.20 : x
  2. Step 2: Convert to fraction form
    3,312.80/4,969.20 = 2,778.20/x
  3. Step 3: Cross multiply
    3,312.80x = 4,969.20 × 2,778.20
  4. Step 4: Simplify right side
    3,312.80x = 13,805,431.44
  5. Step 5: Solve for x
    x = 13,805,431.44/3,312.80
  6. Step 6: Final answer
    x = 4,167.30

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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.