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Finding the Fourth Proportional to 403.85, 557.34 and 235.79

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Solution

The fourth proportional to 403.85, 557.34 and 235.79 is: 325.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.85 : 557.34 = 235.79 : x
  2. Step 2: Convert to fraction form
    403.85/557.34 = 235.79/x
  3. Step 3: Cross multiply
    403.85x = 557.34 × 235.79
  4. Step 4: Simplify right side
    403.85x = 131,413.62
  5. Step 5: Solve for x
    x = 131,413.62/403.85
  6. Step 6: Final answer
    x = 325.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.