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Finding the Fourth Proportional to 421.89, 582.24 and 235.40

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Solution

The fourth proportional to 421.89, 582.24 and 235.40 is: 324.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.89 : 582.24 = 235.40 : x
  2. Step 2: Convert to fraction form
    421.89/582.24 = 235.40/x
  3. Step 3: Cross multiply
    421.89x = 582.24 × 235.40
  4. Step 4: Simplify right side
    421.89x = 137,056.38
  5. Step 5: Solve for x
    x = 137,056.38/421.89
  6. Step 6: Final answer
    x = 324.86

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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.