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Finding the Fourth Proportional to 823.63, 1,235.91 and 438.87

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Solution

The fourth proportional to 823.63, 1,235.91 and 438.87 is: 658.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.63 : 1,235.91 = 438.87 : x
  2. Step 2: Convert to fraction form
    823.63/1,235.91 = 438.87/x
  3. Step 3: Cross multiply
    823.63x = 1,235.91 × 438.87
  4. Step 4: Simplify right side
    823.63x = 542,403.82
  5. Step 5: Solve for x
    x = 542,403.82/823.63
  6. Step 6: Final answer
    x = 658.55

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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.