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Finding the Fourth Proportional to 2,100.74, 3,151.44 and 639.77

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Solution

The fourth proportional to 2,100.74, 3,151.44 and 639.77 is: 959.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.74 : 3,151.44 = 639.77 : x
  2. Step 2: Convert to fraction form
    2,100.74/3,151.44 = 639.77/x
  3. Step 3: Cross multiply
    2,100.74x = 3,151.44 × 639.77
  4. Step 4: Simplify right side
    2,100.74x = 2,016,181.01
  5. Step 5: Solve for x
    x = 2,016,181.01/2,100.74
  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.