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Finding the Third Proportional to 291.09 and 356.06

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Solution

The third proportional to 291.09 and 356.06 is: 435.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.09 : 356.06 = 356.06 : x
  2. Step 2: Convert to fraction form
    291.09/356.06 = 356.06/x
  3. Step 3: Cross multiply
    291.09x = 356.06 × 356.06
  4. Step 4: Simplify right side
    291.09x = 126,780.50
  5. Step 5: Solve for x
    x = 126,780.50/291.09
  6. Step 6: Final answer
    x = 435.53

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.