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Finding the Fourth Proportional to 407.81, 611.78 and 164.21

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Solution

The fourth proportional to 407.81, 611.78 and 164.21 is: 246.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.81 : 611.78 = 164.21 : x
  2. Step 2: Convert to fraction form
    407.81/611.78 = 164.21/x
  3. Step 3: Cross multiply
    407.81x = 611.78 × 164.21
  4. Step 4: Simplify right side
    407.81x = 100,456.51
  5. Step 5: Solve for x
    x = 100,456.51/407.81
  6. Step 6: Final answer
    x = 246.33

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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.