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Finding the Fourth Proportional to 377.78, 521.38 and 289.13

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Solution

The fourth proportional to 377.78, 521.38 and 289.13 is: 399.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.78 : 521.38 = 289.13 : x
  2. Step 2: Convert to fraction form
    377.78/521.38 = 289.13/x
  3. Step 3: Cross multiply
    377.78x = 521.38 × 289.13
  4. Step 4: Simplify right side
    377.78x = 150,745.15
  5. Step 5: Solve for x
    x = 150,745.15/377.78
  6. Step 6: Final answer
    x = 399.03

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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.