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Finding the Fourth Proportional to 1,872.91, 2,808.68 and 639.99

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Solution

The fourth proportional to 1,872.91, 2,808.68 and 639.99 is: 959.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.91 : 2,808.68 = 639.99 : x
  2. Step 2: Convert to fraction form
    1,872.91/2,808.68 = 639.99/x
  3. Step 3: Cross multiply
    1,872.91x = 2,808.68 × 639.99
  4. Step 4: Simplify right side
    1,872.91x = 1,797,527.11
  5. Step 5: Solve for x
    x = 1,797,527.11/1,872.91
  6. Step 6: Final answer
    x = 959.75

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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.