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Finding the Fourth Proportional to 746.15, 1,029.78 and 480.60

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Solution

The fourth proportional to 746.15, 1,029.78 and 480.60 is: 663.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.15 : 1,029.78 = 480.60 : x
  2. Step 2: Convert to fraction form
    746.15/1,029.78 = 480.60/x
  3. Step 3: Cross multiply
    746.15x = 1,029.78 × 480.60
  4. Step 4: Simplify right side
    746.15x = 494,912.27
  5. Step 5: Solve for x
    x = 494,912.27/746.15
  6. Step 6: Final answer
    x = 663.29

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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.