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Finding the Fourth Proportional to 398.40, 597.85 and 193.19

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Solution

The fourth proportional to 398.40, 597.85 and 193.19 is: 289.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.40 : 597.85 = 193.19 : x
  2. Step 2: Convert to fraction form
    398.40/597.85 = 193.19/x
  3. Step 3: Cross multiply
    398.40x = 597.85 × 193.19
  4. Step 4: Simplify right side
    398.40x = 115,499.62
  5. Step 5: Solve for x
    x = 115,499.62/398.40
  6. Step 6: Final answer
    x = 289.91

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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.