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Finding the Fourth Proportional to 3,221.40, 4,824.90 and 2,645.40

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Solution

The fourth proportional to 3,221.40, 4,824.90 and 2,645.40 is: 3,962.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,221.40 : 4,824.90 = 2,645.40 : x
  2. Step 2: Convert to fraction form
    3,221.40/4,824.90 = 2,645.40/x
  3. Step 3: Cross multiply
    3,221.40x = 4,824.90 × 2,645.40
  4. Step 4: Simplify right side
    3,221.40x = 12,763,790.46
  5. Step 5: Solve for x
    x = 12,763,790.46/3,221.40
  6. Step 6: Final answer
    x = 3,962.19

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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.