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Finding the Fourth Proportional to 505.25, 696.95 and 318.67

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Solution

The fourth proportional to 505.25, 696.95 and 318.67 is: 439.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.25 : 696.95 = 318.67 : x
  2. Step 2: Convert to fraction form
    505.25/696.95 = 318.67/x
  3. Step 3: Cross multiply
    505.25x = 696.95 × 318.67
  4. Step 4: Simplify right side
    505.25x = 222,099.43
  5. Step 5: Solve for x
    x = 222,099.43/505.25
  6. Step 6: Final answer
    x = 439.58

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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.