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Finding the Fourth Proportional to 377.81, 520.72 and 318.95

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Solution

The fourth proportional to 377.81, 520.72 and 318.95 is: 439.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.81 : 520.72 = 318.95 : x
  2. Step 2: Convert to fraction form
    377.81/520.72 = 318.95/x
  3. Step 3: Cross multiply
    377.81x = 520.72 × 318.95
  4. Step 4: Simplify right side
    377.81x = 166,084.15
  5. Step 5: Solve for x
    x = 166,084.15/377.81
  6. Step 6: Final answer
    x = 439.59

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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.