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Finding the Fourth Proportional to 320.85, 442.62 and 189.81

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Solution

The fourth proportional to 320.85, 442.62 and 189.81 is: 261.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.85 : 442.62 = 189.81 : x
  2. Step 2: Convert to fraction form
    320.85/442.62 = 189.81/x
  3. Step 3: Cross multiply
    320.85x = 442.62 × 189.81
  4. Step 4: Simplify right side
    320.85x = 84,013.70
  5. Step 5: Solve for x
    x = 84,013.70/320.85
  6. Step 6: Final answer
    x = 261.85

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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.