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Finding the Fourth Proportional to 608.12, 838.65 and 398.23

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Solution

The fourth proportional to 608.12, 838.65 and 398.23 is: 549.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.12 : 838.65 = 398.23 : x
  2. Step 2: Convert to fraction form
    608.12/838.65 = 398.23/x
  3. Step 3: Cross multiply
    608.12x = 838.65 × 398.23
  4. Step 4: Simplify right side
    608.12x = 333,974.99
  5. Step 5: Solve for x
    x = 333,974.99/608.12
  6. Step 6: Final answer
    x = 549.19

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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.