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Finding the Fourth Proportional to 608.40, 911.43 and 485.22

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Solution

The fourth proportional to 608.40, 911.43 and 485.22 is: 726.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 911.43 = 485.22 : x
  2. Step 2: Convert to fraction form
    608.40/911.43 = 485.22/x
  3. Step 3: Cross multiply
    608.40x = 911.43 × 485.22
  4. Step 4: Simplify right side
    608.40x = 442,244.06
  5. Step 5: Solve for x
    x = 442,244.06/608.40
  6. Step 6: Final answer
    x = 726.90

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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.