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Finding the Third Proportional to 478.75 and 727.50

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Solution

The third proportional to 478.75 and 727.50 is: 1,105.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.75 : 727.50 = 727.50 : x
  2. Step 2: Convert to fraction form
    478.75/727.50 = 727.50/x
  3. Step 3: Cross multiply
    478.75x = 727.50 × 727.50
  4. Step 4: Simplify right side
    478.75x = 529,256.25
  5. Step 5: Solve for x
    x = 529,256.25/478.75
  6. Step 6: Final answer
    x = 1,105.50

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.