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Finding the Fourth Proportional to 486.42, 671.31 and 299.87

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Solution

The fourth proportional to 486.42, 671.31 and 299.87 is: 413.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.42 : 671.31 = 299.87 : x
  2. Step 2: Convert to fraction form
    486.42/671.31 = 299.87/x
  3. Step 3: Cross multiply
    486.42x = 671.31 × 299.87
  4. Step 4: Simplify right side
    486.42x = 201,304.23
  5. Step 5: Solve for x
    x = 201,304.23/486.42
  6. Step 6: Final answer
    x = 413.85

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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.