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Finding the Fourth Proportional to 744.20, 1,026.78 and 668.60

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Solution

The fourth proportional to 744.20, 1,026.78 and 668.60 is: 922.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.20 : 1,026.78 = 668.60 : x
  2. Step 2: Convert to fraction form
    744.20/1,026.78 = 668.60/x
  3. Step 3: Cross multiply
    744.20x = 1,026.78 × 668.60
  4. Step 4: Simplify right side
    744.20x = 686,505.11
  5. Step 5: Solve for x
    x = 686,505.11/744.20
  6. Step 6: Final answer
    x = 922.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.