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Finding the Third Proportional to 218.06 and 318.56

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Solution

The third proportional to 218.06 and 318.56 is: 465.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.06 : 318.56 = 318.56 : x
  2. Step 2: Convert to fraction form
    218.06/318.56 = 318.56/x
  3. Step 3: Cross multiply
    218.06x = 318.56 × 318.56
  4. Step 4: Simplify right side
    218.06x = 101,482.07
  5. Step 5: Solve for x
    x = 101,482.07/218.06
  6. Step 6: Final answer
    x = 465.38

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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.