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Finding the Fourth Proportional to 467.40, 645 and 257.56

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Solution

The fourth proportional to 467.40, 645 and 257.56 is: 355.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.40 : 645 = 257.56 : x
  2. Step 2: Convert to fraction form
    467.40/645 = 257.56/x
  3. Step 3: Cross multiply
    467.40x = 645 × 257.56
  4. Step 4: Simplify right side
    467.40x = 166,126.20
  5. Step 5: Solve for x
    x = 166,126.20/467.40
  6. Step 6: Final answer
    x = 355.43

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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.