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Finding the Fourth Proportional to 2,105.74, 3,157.74 and 718.84

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Solution

The fourth proportional to 2,105.74, 3,157.74 and 718.84 is: 1,077.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.74 : 3,157.74 = 718.84 : x
  2. Step 2: Convert to fraction form
    2,105.74/3,157.74 = 718.84/x
  3. Step 3: Cross multiply
    2,105.74x = 3,157.74 × 718.84
  4. Step 4: Simplify right side
    2,105.74x = 2,269,909.82
  5. Step 5: Solve for x
    x = 2,269,909.82/2,105.74
  6. Step 6: Final answer
    x = 1,077.96

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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.