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Finding the Third Proportional to 393.75 and 787.50

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Solution

The third proportional to 393.75 and 787.50 is: 1,575

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 787.50 = 787.50 : x
  2. Step 2: Convert to fraction form
    393.75/787.50 = 787.50/x
  3. Step 3: Cross multiply
    393.75x = 787.50 × 787.50
  4. Step 4: Simplify right side
    393.75x = 620,156.25
  5. Step 5: Solve for x
    x = 620,156.25/393.75
  6. Step 6: Final answer
    x = 1,575

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Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.