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Finding the Fourth Proportional to 486.58, 670.83 and 331.06

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Solution

The fourth proportional to 486.58, 670.83 and 331.06 is: 456.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.58 : 670.83 = 331.06 : x
  2. Step 2: Convert to fraction form
    486.58/670.83 = 331.06/x
  3. Step 3: Cross multiply
    486.58x = 670.83 × 331.06
  4. Step 4: Simplify right side
    486.58x = 222,084.98
  5. Step 5: Solve for x
    x = 222,084.98/486.58
  6. Step 6: Final answer
    x = 456.42

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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.