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Finding the Fourth Proportional to 418.96, 628.26 and 256.60

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Solution

The fourth proportional to 418.96, 628.26 and 256.60 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.96 : 628.26 = 256.60 : x
  2. Step 2: Convert to fraction form
    418.96/628.26 = 256.60/x
  3. Step 3: Cross multiply
    418.96x = 628.26 × 256.60
  4. Step 4: Simplify right side
    418.96x = 161,211.52
  5. Step 5: Solve for x
    x = 161,211.52/418.96
  6. Step 6: Final answer
    x = 384.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.