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Finding the Fourth Proportional to 993.20, 1,489.20 and 445.28

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Solution

The fourth proportional to 993.20, 1,489.20 and 445.28 is: 667.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.20 : 1,489.20 = 445.28 : x
  2. Step 2: Convert to fraction form
    993.20/1,489.20 = 445.28/x
  3. Step 3: Cross multiply
    993.20x = 1,489.20 × 445.28
  4. Step 4: Simplify right side
    993.20x = 663,110.98
  5. Step 5: Solve for x
    x = 663,110.98/993.20
  6. Step 6: Final answer
    x = 667.65

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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.