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Finding the Fourth Proportional to 2,638.10, 3,957.84 and 994.66

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Solution

The fourth proportional to 2,638.10, 3,957.84 and 994.66 is: 1,492.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.10 : 3,957.84 = 994.66 : x
  2. Step 2: Convert to fraction form
    2,638.10/3,957.84 = 994.66/x
  3. Step 3: Cross multiply
    2,638.10x = 3,957.84 × 994.66
  4. Step 4: Simplify right side
    2,638.10x = 3,936,705.13
  5. Step 5: Solve for x
    x = 3,936,705.13/2,638.10
  6. Step 6: Final answer
    x = 1,492.25

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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.