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Finding the Fourth Proportional to 339.25, 505.79 and 318.60

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Solution

The fourth proportional to 339.25, 505.79 and 318.60 is: 475.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.25 : 505.79 = 318.60 : x
  2. Step 2: Convert to fraction form
    339.25/505.79 = 318.60/x
  3. Step 3: Cross multiply
    339.25x = 505.79 × 318.60
  4. Step 4: Simplify right side
    339.25x = 161,144.69
  5. Step 5: Solve for x
    x = 161,144.69/339.25
  6. Step 6: Final answer
    x = 475.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.