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Finding the Third Proportional to 578.50 and 1,276

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Solution

The third proportional to 578.50 and 1,276 is: 2,814.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.50 : 1,276 = 1,276 : x
  2. Step 2: Convert to fraction form
    578.50/1,276 = 1,276/x
  3. Step 3: Cross multiply
    578.50x = 1,276 × 1,276
  4. Step 4: Simplify right side
    578.50x = 1,628,176
  5. Step 5: Solve for x
    x = 1,628,176/578.50
  6. Step 6: Final answer
    x = 2,814.48

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.