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Finding the Fourth Proportional to 719.20, 1,078.69 and 256.97

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Solution

The fourth proportional to 719.20, 1,078.69 and 256.97 is: 385.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.20 : 1,078.69 = 256.97 : x
  2. Step 2: Convert to fraction form
    719.20/1,078.69 = 256.97/x
  3. Step 3: Cross multiply
    719.20x = 1,078.69 × 256.97
  4. Step 4: Simplify right side
    719.20x = 277,194.23
  5. Step 5: Solve for x
    x = 277,194.23/719.20
  6. Step 6: Final answer
    x = 385.42

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1.5x scale

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.