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Finding the Fourth Proportional to 719.87, 1,078.38 and 669.24

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Solution

The fourth proportional to 719.87, 1,078.38 and 669.24 is: 1,002.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.87 : 1,078.38 = 669.24 : x
  2. Step 2: Convert to fraction form
    719.87/1,078.38 = 669.24/x
  3. Step 3: Cross multiply
    719.87x = 1,078.38 × 669.24
  4. Step 4: Simplify right side
    719.87x = 721,695.03
  5. Step 5: Solve for x
    x = 721,695.03/719.87
  6. Step 6: Final answer
    x = 1,002.54

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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.