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Finding the Fourth Proportional to 398.90, 598.35 and 254.90

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Solution

The fourth proportional to 398.90, 598.35 and 254.90 is: 382.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.90 : 598.35 = 254.90 : x
  2. Step 2: Convert to fraction form
    398.90/598.35 = 254.90/x
  3. Step 3: Cross multiply
    398.90x = 598.35 × 254.90
  4. Step 4: Simplify right side
    398.90x = 152,519.42
  5. Step 5: Solve for x
    x = 152,519.42/398.90
  6. Step 6: Final answer
    x = 382.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.