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Finding the Fourth Proportional to 399.15, 598.15 and 193.49

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Solution

The fourth proportional to 399.15, 598.15 and 193.49 is: 289.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.15 : 598.15 = 193.49 : x
  2. Step 2: Convert to fraction form
    399.15/598.15 = 193.49/x
  3. Step 3: Cross multiply
    399.15x = 598.15 × 193.49
  4. Step 4: Simplify right side
    399.15x = 115,734.72
  5. Step 5: Solve for x
    x = 115,734.72/399.15
  6. Step 6: Final answer
    x = 289.95

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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.