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Finding the Fourth Proportional to 382.76, 528.80 and 304.65

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Solution

The fourth proportional to 382.76, 528.80 and 304.65 is: 420.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.76 : 528.80 = 304.65 : x
  2. Step 2: Convert to fraction form
    382.76/528.80 = 304.65/x
  3. Step 3: Cross multiply
    382.76x = 528.80 × 304.65
  4. Step 4: Simplify right side
    382.76x = 161,097.40
  5. Step 5: Solve for x
    x = 161,097.40/382.76
  6. Step 6: Final answer
    x = 420.89

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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.