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Finding the Fourth Proportional to 505.42, 757.89 and 319.97

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Solution

The fourth proportional to 505.42, 757.89 and 319.97 is: 479.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.42 : 757.89 = 319.97 : x
  2. Step 2: Convert to fraction form
    505.42/757.89 = 319.97/x
  3. Step 3: Cross multiply
    505.42x = 757.89 × 319.97
  4. Step 4: Simplify right side
    505.42x = 242,503.96
  5. Step 5: Solve for x
    x = 242,503.96/505.42
  6. Step 6: Final answer
    x = 479.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.