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Finding the Fourth Proportional to 748.84, 1,121.44 and 646.78

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Solution

The fourth proportional to 748.84, 1,121.44 and 646.78 is: 968.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.84 : 1,121.44 = 646.78 : x
  2. Step 2: Convert to fraction form
    748.84/1,121.44 = 646.78/x
  3. Step 3: Cross multiply
    748.84x = 1,121.44 × 646.78
  4. Step 4: Simplify right side
    748.84x = 725,324.96
  5. Step 5: Solve for x
    x = 725,324.96/748.84
  6. Step 6: Final answer
    x = 968.60

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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.