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Finding the Third Proportional to 280 and 368.75

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Solution

The third proportional to 280 and 368.75 is: 485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    280 : 368.75 = 368.75 : x
  2. Step 2: Convert to fraction form
    280/368.75 = 368.75/x
  3. Step 3: Cross multiply
    280x = 368.75 × 368.75
  4. Step 4: Simplify right side
    280x = 135,976.56
  5. Step 5: Solve for x
    x = 135,976.56/280
  6. Step 6: Final answer
    x = 485.63

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.