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Finding the Fourth Proportional to 608.07, 838.74 and 386.85

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Solution

The fourth proportional to 608.07, 838.74 and 386.85 is: 533.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.07 : 838.74 = 386.85 : x
  2. Step 2: Convert to fraction form
    608.07/838.74 = 386.85/x
  3. Step 3: Cross multiply
    608.07x = 838.74 × 386.85
  4. Step 4: Simplify right side
    608.07x = 324,466.57
  5. Step 5: Solve for x
    x = 324,466.57/608.07
  6. Step 6: Final answer
    x = 533.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.