Home / 1,872.18-2,808.61-639.29

Finding the Fourth Proportional to 1,872.18, 2,808.61 and 639.29

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Solution

The fourth proportional to 1,872.18, 2,808.61 and 639.29 is: 959.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.18 : 2,808.61 = 639.29 : x
  2. Step 2: Convert to fraction form
    1,872.18/2,808.61 = 639.29/x
  3. Step 3: Cross multiply
    1,872.18x = 2,808.61 × 639.29
  4. Step 4: Simplify right side
    1,872.18x = 1,795,521.71
  5. Step 5: Solve for x
    x = 1,795,521.71/1,872.18
  6. Step 6: Final answer
    x = 959.05

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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.