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Finding the Fourth Proportional to 993.87, 1,489.73 and 628.76

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Solution

The fourth proportional to 993.87, 1,489.73 and 628.76 is: 942.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.87 : 1,489.73 = 628.76 : x
  2. Step 2: Convert to fraction form
    993.87/1,489.73 = 628.76/x
  3. Step 3: Cross multiply
    993.87x = 1,489.73 × 628.76
  4. Step 4: Simplify right side
    993.87x = 936,687.93
  5. Step 5: Solve for x
    x = 936,687.93/993.87
  6. Step 6: Final answer
    x = 942.47

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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.