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Finding the Third Proportional to 267.75 and 390.38

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Solution

The third proportional to 267.75 and 390.38 is: 569.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.75 : 390.38 = 390.38 : x
  2. Step 2: Convert to fraction form
    267.75/390.38 = 390.38/x
  3. Step 3: Cross multiply
    267.75x = 390.38 × 390.38
  4. Step 4: Simplify right side
    267.75x = 152,392.64
  5. Step 5: Solve for x
    x = 152,392.64/267.75
  6. Step 6: Final answer
    x = 569.16

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.