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Finding the Fourth Proportional to 744.22, 1,109.31 and 688.84

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Solution

The fourth proportional to 744.22, 1,109.31 and 688.84 is: 1,026.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.22 : 1,109.31 = 688.84 : x
  2. Step 2: Convert to fraction form
    744.22/1,109.31 = 688.84/x
  3. Step 3: Cross multiply
    744.22x = 1,109.31 × 688.84
  4. Step 4: Simplify right side
    744.22x = 764,137.10
  5. Step 5: Solve for x
    x = 764,137.10/744.22
  6. Step 6: Final answer
    x = 1,026.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.