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Finding the Fourth Proportional to 1,396.35, 1,926.54 and 806.81

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Solution

The fourth proportional to 1,396.35, 1,926.54 and 806.81 is: 1,113.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.35 : 1,926.54 = 806.81 : x
  2. Step 2: Convert to fraction form
    1,396.35/1,926.54 = 806.81/x
  3. Step 3: Cross multiply
    1,396.35x = 1,926.54 × 806.81
  4. Step 4: Simplify right side
    1,396.35x = 1,554,342.10
  5. Step 5: Solve for x
    x = 1,554,342.10/1,396.35
  6. Step 6: Final answer
    x = 1,113.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.