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Finding the Fourth Proportional to 945.89, 1,418.93 and 398.33

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Solution

The fourth proportional to 945.89, 1,418.93 and 398.33 is: 597.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.89 : 1,418.93 = 398.33 : x
  2. Step 2: Convert to fraction form
    945.89/1,418.93 = 398.33/x
  3. Step 3: Cross multiply
    945.89x = 1,418.93 × 398.33
  4. Step 4: Simplify right side
    945.89x = 565,202.39
  5. Step 5: Solve for x
    x = 565,202.39/945.89
  6. Step 6: Final answer
    x = 597.54

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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.