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Finding the Fourth Proportional to 719.10, 1,078.64 and 445.28

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Solution

The fourth proportional to 719.10, 1,078.64 and 445.28 is: 667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.10 : 1,078.64 = 445.28 : x
  2. Step 2: Convert to fraction form
    719.10/1,078.64 = 445.28/x
  3. Step 3: Cross multiply
    719.10x = 1,078.64 × 445.28
  4. Step 4: Simplify right side
    719.10x = 480,289.20
  5. Step 5: Solve for x
    x = 480,289.20/719.10
  6. Step 6: Final answer
    x = 667.90

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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.