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Finding the Fourth Proportional to 320.19, 441.81 and 189.21

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Solution

The fourth proportional to 320.19, 441.81 and 189.21 is: 261.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.19 : 441.81 = 189.21 : x
  2. Step 2: Convert to fraction form
    320.19/441.81 = 189.21/x
  3. Step 3: Cross multiply
    320.19x = 441.81 × 189.21
  4. Step 4: Simplify right side
    320.19x = 83,594.87
  5. Step 5: Solve for x
    x = 83,594.87/320.19
  6. Step 6: Final answer
    x = 261.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.