Home / 3,219.90-4,829.89-911.40

Finding the Fourth Proportional to 3,219.90, 4,829.89 and 911.40

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Solution

The fourth proportional to 3,219.90, 4,829.89 and 911.40 is: 1,367.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,219.90 : 4,829.89 = 911.40 : x
  2. Step 2: Convert to fraction form
    3,219.90/4,829.89 = 911.40/x
  3. Step 3: Cross multiply
    3,219.90x = 4,829.89 × 911.40
  4. Step 4: Simplify right side
    3,219.90x = 4,401,961.75
  5. Step 5: Solve for x
    x = 4,401,961.75/3,219.90
  6. Step 6: Final answer
    x = 1,367.11

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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.