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Finding the Fourth Proportional to 719.70, 1,078.64 and 308.29

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Solution

The fourth proportional to 719.70, 1,078.64 and 308.29 is: 462.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.70 : 1,078.64 = 308.29 : x
  2. Step 2: Convert to fraction form
    719.70/1,078.64 = 308.29/x
  3. Step 3: Cross multiply
    719.70x = 1,078.64 × 308.29
  4. Step 4: Simplify right side
    719.70x = 332,533.93
  5. Step 5: Solve for x
    x = 332,533.93/719.70
  6. Step 6: Final answer
    x = 462.05

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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.