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Finding the Fourth Proportional to 518.81, 778.23 and 287.67

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Solution

The fourth proportional to 518.81, 778.23 and 287.67 is: 431.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.81 : 778.23 = 287.67 : x
  2. Step 2: Convert to fraction form
    518.81/778.23 = 287.67/x
  3. Step 3: Cross multiply
    518.81x = 778.23 × 287.67
  4. Step 4: Simplify right side
    518.81x = 223,873.42
  5. Step 5: Solve for x
    x = 223,873.42/518.81
  6. Step 6: Final answer
    x = 431.51

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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.