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Finding the Fourth Proportional to 738.54, 1,018.94 and 668.36

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Solution

The fourth proportional to 738.54, 1,018.94 and 668.36 is: 922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.54 : 1,018.94 = 668.36 : x
  2. Step 2: Convert to fraction form
    738.54/1,018.94 = 668.36/x
  3. Step 3: Cross multiply
    738.54x = 1,018.94 × 668.36
  4. Step 4: Simplify right side
    738.54x = 681,010.30
  5. Step 5: Solve for x
    x = 681,010.30/738.54
  6. Step 6: Final answer
    x = 922.10

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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.