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Finding the Fourth Proportional to 505.67, 697.74 and 319.26

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Solution

The fourth proportional to 505.67, 697.74 and 319.26 is: 440.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.67 : 697.74 = 319.26 : x
  2. Step 2: Convert to fraction form
    505.67/697.74 = 319.26/x
  3. Step 3: Cross multiply
    505.67x = 697.74 × 319.26
  4. Step 4: Simplify right side
    505.67x = 222,760.47
  5. Step 5: Solve for x
    x = 222,760.47/505.67
  6. Step 6: Final answer
    x = 440.53

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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.