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Finding the Fourth Proportional to 2,102.64, 3,153.80 and 949.20

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Solution

The fourth proportional to 2,102.64, 3,153.80 and 949.20 is: 1,423.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,102.64 : 3,153.80 = 949.20 : x
  2. Step 2: Convert to fraction form
    2,102.64/3,153.80 = 949.20/x
  3. Step 3: Cross multiply
    2,102.64x = 3,153.80 × 949.20
  4. Step 4: Simplify right side
    2,102.64x = 2,993,586.96
  5. Step 5: Solve for x
    x = 2,993,586.96/2,102.64
  6. Step 6: Final answer
    x = 1,423.73

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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.