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Finding the Fourth Proportional to 2,405.45, 3,321.05 and 1,964.40

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Solution

The fourth proportional to 2,405.45, 3,321.05 and 1,964.40 is: 2,712.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,405.45 : 3,321.05 = 1,964.40 : x
  2. Step 2: Convert to fraction form
    2,405.45/3,321.05 = 1,964.40/x
  3. Step 3: Cross multiply
    2,405.45x = 3,321.05 × 1,964.40
  4. Step 4: Simplify right side
    2,405.45x = 6,523,860.80
  5. Step 5: Solve for x
    x = 6,523,860.80/2,405.45
  6. Step 6: Final answer
    x = 2,712.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.