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Finding the Fourth Proportional to 1,076.79, 1,614.24 and 638.85

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Solution

The fourth proportional to 1,076.79, 1,614.24 and 638.85 is: 957.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.79 : 1,614.24 = 638.85 : x
  2. Step 2: Convert to fraction form
    1,076.79/1,614.24 = 638.85/x
  3. Step 3: Cross multiply
    1,076.79x = 1,614.24 × 638.85
  4. Step 4: Simplify right side
    1,076.79x = 1,031,257.22
  5. Step 5: Solve for x
    x = 1,031,257.22/1,076.79
  6. Step 6: Final answer
    x = 957.71

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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.