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Finding the Fourth Proportional to 676.97, 1,015.46 and 388.49

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Solution

The fourth proportional to 676.97, 1,015.46 and 388.49 is: 582.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.97 : 1,015.46 = 388.49 : x
  2. Step 2: Convert to fraction form
    676.97/1,015.46 = 388.49/x
  3. Step 3: Cross multiply
    676.97x = 1,015.46 × 388.49
  4. Step 4: Simplify right side
    676.97x = 394,496.06
  5. Step 5: Solve for x
    x = 394,496.06/676.97
  6. Step 6: Final answer
    x = 582.74

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1.5x scale

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.