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Finding the Fourth Proportional to 719.26, 1,078.97 and 257.31

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Solution

The fourth proportional to 719.26, 1,078.97 and 257.31 is: 385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.26 : 1,078.97 = 257.31 : x
  2. Step 2: Convert to fraction form
    719.26/1,078.97 = 257.31/x
  3. Step 3: Cross multiply
    719.26x = 1,078.97 × 257.31
  4. Step 4: Simplify right side
    719.26x = 277,628.48
  5. Step 5: Solve for x
    x = 277,628.48/719.26
  6. Step 6: Final answer
    x = 385.99

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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.