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Finding the Fourth Proportional to 331.06, 494.20 and 284.89

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Solution

The fourth proportional to 331.06, 494.20 and 284.89 is: 425.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.06 : 494.20 = 284.89 : x
  2. Step 2: Convert to fraction form
    331.06/494.20 = 284.89/x
  3. Step 3: Cross multiply
    331.06x = 494.20 × 284.89
  4. Step 4: Simplify right side
    331.06x = 140,792.64
  5. Step 5: Solve for x
    x = 140,792.64/331.06
  6. Step 6: Final answer
    x = 425.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.