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Finding the Fourth Proportional to 608.04, 839.20 and 398.20

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Solution

The fourth proportional to 608.04, 839.20 and 398.20 is: 549.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.04 : 839.20 = 398.20 : x
  2. Step 2: Convert to fraction form
    608.04/839.20 = 398.20/x
  3. Step 3: Cross multiply
    608.04x = 839.20 × 398.20
  4. Step 4: Simplify right side
    608.04x = 334,169.44
  5. Step 5: Solve for x
    x = 334,169.44/608.04
  6. Step 6: Final answer
    x = 549.58

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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.