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Finding the Fourth Proportional to 608.40, 911.99 and 300.47

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Solution

The fourth proportional to 608.40, 911.99 and 300.47 is: 450.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 911.99 = 300.47 : x
  2. Step 2: Convert to fraction form
    608.40/911.99 = 300.47/x
  3. Step 3: Cross multiply
    608.40x = 911.99 × 300.47
  4. Step 4: Simplify right side
    608.40x = 274,024.88
  5. Step 5: Solve for x
    x = 274,024.88/608.40
  6. Step 6: Final answer
    x = 450.40

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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.