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Finding the Fourth Proportional to 421.87, 582.18 and 235.39

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Solution

The fourth proportional to 421.87, 582.18 and 235.39 is: 324.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.87 : 582.18 = 235.39 : x
  2. Step 2: Convert to fraction form
    421.87/582.18 = 235.39/x
  3. Step 3: Cross multiply
    421.87x = 582.18 × 235.39
  4. Step 4: Simplify right side
    421.87x = 137,039.35
  5. Step 5: Solve for x
    x = 137,039.35/421.87
  6. Step 6: Final answer
    x = 324.84

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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.