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Finding the Fourth Proportional to 993.84, 1,489.44 and 445.20

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Solution

The fourth proportional to 993.84, 1,489.44 and 445.20 is: 667.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.84 : 1,489.44 = 445.20 : x
  2. Step 2: Convert to fraction form
    993.84/1,489.44 = 445.20/x
  3. Step 3: Cross multiply
    993.84x = 1,489.44 × 445.20
  4. Step 4: Simplify right side
    993.84x = 663,098.69
  5. Step 5: Solve for x
    x = 663,098.69/993.84
  6. Step 6: Final answer
    x = 667.21

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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.