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Finding the Fourth Proportional to 421.94, 632.87 and 285.86

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Solution

The fourth proportional to 421.94, 632.87 and 285.86 is: 428.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.94 : 632.87 = 285.86 : x
  2. Step 2: Convert to fraction form
    421.94/632.87 = 285.86/x
  3. Step 3: Cross multiply
    421.94x = 632.87 × 285.86
  4. Step 4: Simplify right side
    421.94x = 180,912.22
  5. Step 5: Solve for x
    x = 180,912.22/421.94
  6. Step 6: Final answer
    x = 428.76

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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.