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Finding the Fourth Proportional to 380.30, 524.48 and 306.60

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Solution

The fourth proportional to 380.30, 524.48 and 306.60 is: 422.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.30 : 524.48 = 306.60 : x
  2. Step 2: Convert to fraction form
    380.30/524.48 = 306.60/x
  3. Step 3: Cross multiply
    380.30x = 524.48 × 306.60
  4. Step 4: Simplify right side
    380.30x = 160,805.57
  5. Step 5: Solve for x
    x = 160,805.57/380.30
  6. Step 6: Final answer
    x = 422.84

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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.