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Finding the Third Proportional to 178.75 and 390.38

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Solution

The third proportional to 178.75 and 390.38 is: 852.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.75 : 390.38 = 390.38 : x
  2. Step 2: Convert to fraction form
    178.75/390.38 = 390.38/x
  3. Step 3: Cross multiply
    178.75x = 390.38 × 390.38
  4. Step 4: Simplify right side
    178.75x = 152,392.64
  5. Step 5: Solve for x
    x = 152,392.64/178.75
  6. Step 6: Final answer
    x = 852.55

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.