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Finding the Fourth Proportional to 398.85, 598.86 and 236.63

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Solution

The fourth proportional to 398.85, 598.86 and 236.63 is: 355.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.85 : 598.86 = 236.63 : x
  2. Step 2: Convert to fraction form
    398.85/598.86 = 236.63/x
  3. Step 3: Cross multiply
    398.85x = 598.86 × 236.63
  4. Step 4: Simplify right side
    398.85x = 141,705.25
  5. Step 5: Solve for x
    x = 141,705.25/398.85
  6. Step 6: Final answer
    x = 355.28

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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.