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Finding the Fourth Proportional to 2,105.82, 3,157.74 and 644.58

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Solution

The fourth proportional to 2,105.82, 3,157.74 and 644.58 is: 966.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.82 : 3,157.74 = 644.58 : x
  2. Step 2: Convert to fraction form
    2,105.82/3,157.74 = 644.58/x
  3. Step 3: Cross multiply
    2,105.82x = 3,157.74 × 644.58
  4. Step 4: Simplify right side
    2,105.82x = 2,035,416.05
  5. Step 5: Solve for x
    x = 2,035,416.05/2,105.82
  6. Step 6: Final answer
    x = 966.57

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1.5x scale

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.