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Finding the Fourth Proportional to 1,356.22, 1,871.94 and 936.64

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Solution

The fourth proportional to 1,356.22, 1,871.94 and 936.64 is: 1,292.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.22 : 1,871.94 = 936.64 : x
  2. Step 2: Convert to fraction form
    1,356.22/1,871.94 = 936.64/x
  3. Step 3: Cross multiply
    1,356.22x = 1,871.94 × 936.64
  4. Step 4: Simplify right side
    1,356.22x = 1,753,333.88
  5. Step 5: Solve for x
    x = 1,753,333.88/1,356.22
  6. Step 6: Final answer
    x = 1,292.81

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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.