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Finding the Fourth Proportional to 608.26, 912.39 and 485.95

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Solution

The fourth proportional to 608.26, 912.39 and 485.95 is: 728.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.26 : 912.39 = 485.95 : x
  2. Step 2: Convert to fraction form
    608.26/912.39 = 485.95/x
  3. Step 3: Cross multiply
    608.26x = 912.39 × 485.95
  4. Step 4: Simplify right side
    608.26x = 443,368.93
  5. Step 5: Solve for x
    x = 443,368.93/608.26
  6. Step 6: Final answer
    x = 728.92

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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.