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Finding the Fourth Proportional to 398.95, 598.37 and 155.39

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Solution

The fourth proportional to 398.95, 598.37 and 155.39 is: 233.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.95 : 598.37 = 155.39 : x
  2. Step 2: Convert to fraction form
    398.95/598.37 = 155.39/x
  3. Step 3: Cross multiply
    398.95x = 598.37 × 155.39
  4. Step 4: Simplify right side
    398.95x = 92,976.95
  5. Step 5: Solve for x
    x = 92,976.95/398.95
  6. Step 6: Final answer
    x = 233.06

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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.