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Finding the Fourth Proportional to 719.25, 1,078.68 and 256.97

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Solution

The fourth proportional to 719.25, 1,078.68 and 256.97 is: 385.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.25 : 1,078.68 = 256.97 : x
  2. Step 2: Convert to fraction form
    719.25/1,078.68 = 256.97/x
  3. Step 3: Cross multiply
    719.25x = 1,078.68 × 256.97
  4. Step 4: Simplify right side
    719.25x = 277,192.06
  5. Step 5: Solve for x
    x = 277,192.06/719.25
  6. Step 6: Final answer
    x = 385.39

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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.