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Finding the Fourth Proportional to 1,872.62, 2,808.69 and 640.16

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Solution

The fourth proportional to 1,872.62, 2,808.69 and 640.16 is: 960.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.62 : 2,808.69 = 640.16 : x
  2. Step 2: Convert to fraction form
    1,872.62/2,808.69 = 640.16/x
  3. Step 3: Cross multiply
    1,872.62x = 2,808.69 × 640.16
  4. Step 4: Simplify right side
    1,872.62x = 1,797,996.95
  5. Step 5: Solve for x
    x = 1,797,996.95/1,872.62
  6. Step 6: Final answer
    x = 960.15

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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.