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Finding the Fourth Proportional to 481.85, 665.42 and 316.15

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Solution

The fourth proportional to 481.85, 665.42 and 316.15 is: 436.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.85 : 665.42 = 316.15 : x
  2. Step 2: Convert to fraction form
    481.85/665.42 = 316.15/x
  3. Step 3: Cross multiply
    481.85x = 665.42 × 316.15
  4. Step 4: Simplify right side
    481.85x = 210,373.03
  5. Step 5: Solve for x
    x = 210,373.03/481.85
  6. Step 6: Final answer
    x = 436.60

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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.