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Finding the Fourth Proportional to 719.49, 1,078.44 and 308.91

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Solution

The fourth proportional to 719.49, 1,078.44 and 308.91 is: 463.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.49 : 1,078.44 = 308.91 : x
  2. Step 2: Convert to fraction form
    719.49/1,078.44 = 308.91/x
  3. Step 3: Cross multiply
    719.49x = 1,078.44 × 308.91
  4. Step 4: Simplify right side
    719.49x = 333,140.90
  5. Step 5: Solve for x
    x = 333,140.90/719.49
  6. Step 6: Final answer
    x = 463.02

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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.