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Finding the Fourth Proportional to 1,076.44, 1,486.20 and 678.28

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Solution

The fourth proportional to 1,076.44, 1,486.20 and 678.28 is: 936.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.44 : 1,486.20 = 678.28 : x
  2. Step 2: Convert to fraction form
    1,076.44/1,486.20 = 678.28/x
  3. Step 3: Cross multiply
    1,076.44x = 1,486.20 × 678.28
  4. Step 4: Simplify right side
    1,076.44x = 1,008,059.74
  5. Step 5: Solve for x
    x = 1,008,059.74/1,076.44
  6. Step 6: Final answer
    x = 936.48

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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.