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Finding the Fourth Proportional to 331.95, 457.91 and 308.49

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Solution

The fourth proportional to 331.95, 457.91 and 308.49 is: 425.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.95 : 457.91 = 308.49 : x
  2. Step 2: Convert to fraction form
    331.95/457.91 = 308.49/x
  3. Step 3: Cross multiply
    331.95x = 457.91 × 308.49
  4. Step 4: Simplify right side
    331.95x = 141,256.82
  5. Step 5: Solve for x
    x = 141,256.82/331.95
  6. Step 6: Final answer
    x = 425.54

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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.