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Finding the Fourth Proportional to 1,076.56, 1,614.20 and 427.44

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Solution

The fourth proportional to 1,076.56, 1,614.20 and 427.44 is: 640.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.56 : 1,614.20 = 427.44 : x
  2. Step 2: Convert to fraction form
    1,076.56/1,614.20 = 427.44/x
  3. Step 3: Cross multiply
    1,076.56x = 1,614.20 × 427.44
  4. Step 4: Simplify right side
    1,076.56x = 689,973.65
  5. Step 5: Solve for x
    x = 689,973.65/1,076.56
  6. Step 6: Final answer
    x = 640.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.