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Finding the Fourth Proportional to 608.58, 839.88 and 398.43

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Solution

The fourth proportional to 608.58, 839.88 and 398.43 is: 549.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.58 : 839.88 = 398.43 : x
  2. Step 2: Convert to fraction form
    608.58/839.88 = 398.43/x
  3. Step 3: Cross multiply
    608.58x = 839.88 × 398.43
  4. Step 4: Simplify right side
    608.58x = 334,633.39
  5. Step 5: Solve for x
    x = 334,633.39/608.58
  6. Step 6: Final answer
    x = 549.86

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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.