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Finding the Fourth Proportional to 455.42, 628.41 and 256.21

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Solution

The fourth proportional to 455.42, 628.41 and 256.21 is: 353.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.42 : 628.41 = 256.21 : x
  2. Step 2: Convert to fraction form
    455.42/628.41 = 256.21/x
  3. Step 3: Cross multiply
    455.42x = 628.41 × 256.21
  4. Step 4: Simplify right side
    455.42x = 161,006.41
  5. Step 5: Solve for x
    x = 161,006.41/455.42
  6. Step 6: Final answer
    x = 353.53

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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.