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Finding the Fourth Proportional to 320.45, 442.23 and 189.47

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Solution

The fourth proportional to 320.45, 442.23 and 189.47 is: 261.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.45 : 442.23 = 189.47 : x
  2. Step 2: Convert to fraction form
    320.45/442.23 = 189.47/x
  3. Step 3: Cross multiply
    320.45x = 442.23 × 189.47
  4. Step 4: Simplify right side
    320.45x = 83,787.11
  5. Step 5: Solve for x
    x = 83,787.11/320.45
  6. Step 6: Final answer
    x = 261.47

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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.