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Finding the Fourth Proportional to 320.65, 442.48 and 189.61

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Solution

The fourth proportional to 320.65, 442.48 and 189.61 is: 261.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.65 : 442.48 = 189.61 : x
  2. Step 2: Convert to fraction form
    320.65/442.48 = 189.61/x
  3. Step 3: Cross multiply
    320.65x = 442.48 × 189.61
  4. Step 4: Simplify right side
    320.65x = 83,898.63
  5. Step 5: Solve for x
    x = 83,898.63/320.65
  6. Step 6: Final answer
    x = 261.65

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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.