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Finding the Fourth Proportional to 3,315, 4,969.40 and 1,122.20

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Solution

The fourth proportional to 3,315, 4,969.40 and 1,122.20 is: 1,682.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,315 : 4,969.40 = 1,122.20 : x
  2. Step 2: Convert to fraction form
    3,315/4,969.40 = 1,122.20/x
  3. Step 3: Cross multiply
    3,315x = 4,969.40 × 1,122.20
  4. Step 4: Simplify right side
    3,315x = 5,576,660.68
  5. Step 5: Solve for x
    x = 5,576,660.68/3,315
  6. Step 6: Final answer
    x = 1,682.25

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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.