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Finding the Fourth Proportional to 5,191, 7,786.50 and 1,728.52

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Solution

The fourth proportional to 5,191, 7,786.50 and 1,728.52 is: 2,592.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,191 : 7,786.50 = 1,728.52 : x
  2. Step 2: Convert to fraction form
    5,191/7,786.50 = 1,728.52/x
  3. Step 3: Cross multiply
    5,191x = 7,786.50 × 1,728.52
  4. Step 4: Simplify right side
    5,191x = 13,459,120.98
  5. Step 5: Solve for x
    x = 13,459,120.98/5,191
  6. Step 6: Final answer
    x = 2,592.78

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Double scale
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Similar ratio
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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.