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Finding the Fourth Proportional to 421.82, 581.79 and 281.89

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Solution

The fourth proportional to 421.82, 581.79 and 281.89 is: 388.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.82 : 581.79 = 281.89 : x
  2. Step 2: Convert to fraction form
    421.82/581.79 = 281.89/x
  3. Step 3: Cross multiply
    421.82x = 581.79 × 281.89
  4. Step 4: Simplify right side
    421.82x = 164,002.57
  5. Step 5: Solve for x
    x = 164,002.57/421.82
  6. Step 6: Final answer
    x = 388.80

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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.