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Finding the Fourth Proportional to 1,076.70, 1,485.31 and 678.85

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Solution

The fourth proportional to 1,076.70, 1,485.31 and 678.85 is: 936.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.70 : 1,485.31 = 678.85 : x
  2. Step 2: Convert to fraction form
    1,076.70/1,485.31 = 678.85/x
  3. Step 3: Cross multiply
    1,076.70x = 1,485.31 × 678.85
  4. Step 4: Simplify right side
    1,076.70x = 1,008,302.69
  5. Step 5: Solve for x
    x = 1,008,302.69/1,076.70
  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.