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Finding the Fourth Proportional to 1,872.24, 2,808.36 and 639.03

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Solution

The fourth proportional to 1,872.24, 2,808.36 and 639.03 is: 958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.24 : 2,808.36 = 639.03 : x
  2. Step 2: Convert to fraction form
    1,872.24/2,808.36 = 639.03/x
  3. Step 3: Cross multiply
    1,872.24x = 2,808.36 × 639.03
  4. Step 4: Simplify right side
    1,872.24x = 1,794,626.29
  5. Step 5: Solve for x
    x = 1,794,626.29/1,872.24
  6. Step 6: Final answer
    x = 958.55

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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.