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Finding the Fourth Proportional to 218.68, 326.65 and 186.28

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Solution

The fourth proportional to 218.68, 326.65 and 186.28 is: 278.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.68 : 326.65 = 186.28 : x
  2. Step 2: Convert to fraction form
    218.68/326.65 = 186.28/x
  3. Step 3: Cross multiply
    218.68x = 326.65 × 186.28
  4. Step 4: Simplify right side
    218.68x = 60,848.36
  5. Step 5: Solve for x
    x = 60,848.36/218.68
  6. Step 6: Final answer
    x = 278.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.