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Finding the Fourth Proportional to 993.90, 1,491.12 and 300.54

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Solution

The fourth proportional to 993.90, 1,491.12 and 300.54 is: 450.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.90 : 1,491.12 = 300.54 : x
  2. Step 2: Convert to fraction form
    993.90/1,491.12 = 300.54/x
  3. Step 3: Cross multiply
    993.90x = 1,491.12 × 300.54
  4. Step 4: Simplify right side
    993.90x = 448,141.20
  5. Step 5: Solve for x
    x = 448,141.20/993.90
  6. Step 6: Final answer
    x = 450.89

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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.