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Finding the Third Proportional to 305 and 488.75

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Solution

The third proportional to 305 and 488.75 is: 783.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    305 : 488.75 = 488.75 : x
  2. Step 2: Convert to fraction form
    305/488.75 = 488.75/x
  3. Step 3: Cross multiply
    305x = 488.75 × 488.75
  4. Step 4: Simplify right side
    305x = 238,876.56
  5. Step 5: Solve for x
    x = 238,876.56/305
  6. Step 6: Final answer
    x = 783.20

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.