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Finding the Fourth Proportional to 328.51, 491.73 and 218.61

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Solution

The fourth proportional to 328.51, 491.73 and 218.61 is: 327.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.51 : 491.73 = 218.61 : x
  2. Step 2: Convert to fraction form
    328.51/491.73 = 218.61/x
  3. Step 3: Cross multiply
    328.51x = 491.73 × 218.61
  4. Step 4: Simplify right side
    328.51x = 107,494.64
  5. Step 5: Solve for x
    x = 107,494.64/328.51
  6. Step 6: Final answer
    x = 327.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.