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Finding the Third Proportional to 272.25 and 390.25

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Solution

The third proportional to 272.25 and 390.25 is: 559.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.25 : 390.25 = 390.25 : x
  2. Step 2: Convert to fraction form
    272.25/390.25 = 390.25/x
  3. Step 3: Cross multiply
    272.25x = 390.25 × 390.25
  4. Step 4: Simplify right side
    272.25x = 152,295.06
  5. Step 5: Solve for x
    x = 152,295.06/272.25
  6. Step 6: Final answer
    x = 559.39

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.