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Finding the Fourth Proportional to 493.02, 678.78 and 381.96

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Solution

The fourth proportional to 493.02, 678.78 and 381.96 is: 525.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.02 : 678.78 = 381.96 : x
  2. Step 2: Convert to fraction form
    493.02/678.78 = 381.96/x
  3. Step 3: Cross multiply
    493.02x = 678.78 × 381.96
  4. Step 4: Simplify right side
    493.02x = 259,266.81
  5. Step 5: Solve for x
    x = 259,266.81/493.02
  6. Step 6: Final answer
    x = 525.87

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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.