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Finding the Fourth Proportional to 1,395.72, 1,926 and 806.28

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Solution

The fourth proportional to 1,395.72, 1,926 and 806.28 is: 1,112.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.72 : 1,926 = 806.28 : x
  2. Step 2: Convert to fraction form
    1,395.72/1,926 = 806.28/x
  3. Step 3: Cross multiply
    1,395.72x = 1,926 × 806.28
  4. Step 4: Simplify right side
    1,395.72x = 1,552,895.28
  5. Step 5: Solve for x
    x = 1,552,895.28/1,395.72
  6. Step 6: Final answer
    x = 1,112.61

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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.