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Finding the Fourth Proportional to 608.11, 838.91 and 386.98

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Solution

The fourth proportional to 608.11, 838.91 and 386.98 is: 533.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.11 : 838.91 = 386.98 : x
  2. Step 2: Convert to fraction form
    608.11/838.91 = 386.98/x
  3. Step 3: Cross multiply
    608.11x = 838.91 × 386.98
  4. Step 4: Simplify right side
    608.11x = 324,640.26
  5. Step 5: Solve for x
    x = 324,640.26/608.11
  6. Step 6: Final answer
    x = 533.85

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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.