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Finding the Fourth Proportional to 320.88, 442.80 and 189.90

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Solution

The fourth proportional to 320.88, 442.80 and 189.90 is: 262.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.88 : 442.80 = 189.90 : x
  2. Step 2: Convert to fraction form
    320.88/442.80 = 189.90/x
  3. Step 3: Cross multiply
    320.88x = 442.80 × 189.90
  4. Step 4: Simplify right side
    320.88x = 84,087.72
  5. Step 5: Solve for x
    x = 84,087.72/320.88
  6. Step 6: Final answer
    x = 262.05

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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.