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Finding the Fourth Proportional to 380.39, 524.85 and 256.28

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Solution

The fourth proportional to 380.39, 524.85 and 256.28 is: 353.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.39 : 524.85 = 256.28 : x
  2. Step 2: Convert to fraction form
    380.39/524.85 = 256.28/x
  3. Step 3: Cross multiply
    380.39x = 524.85 × 256.28
  4. Step 4: Simplify right side
    380.39x = 134,508.56
  5. Step 5: Solve for x
    x = 134,508.56/380.39
  6. Step 6: Final answer
    x = 353.61

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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.