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Finding the Fourth Proportional to 1,872.12, 2,807.82 and 639.42

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Solution

The fourth proportional to 1,872.12, 2,807.82 and 639.42 is: 959.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.12 : 2,807.82 = 639.42 : x
  2. Step 2: Convert to fraction form
    1,872.12/2,807.82 = 639.42/x
  3. Step 3: Cross multiply
    1,872.12x = 2,807.82 × 639.42
  4. Step 4: Simplify right side
    1,872.12x = 1,795,376.26
  5. Step 5: Solve for x
    x = 1,795,376.26/1,872.12
  6. Step 6: Final answer
    x = 959.01

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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.