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Finding the Fourth Proportional to 605.21, 907.81 and 331.43

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Solution

The fourth proportional to 605.21, 907.81 and 331.43 is: 497.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.21 : 907.81 = 331.43 : x
  2. Step 2: Convert to fraction form
    605.21/907.81 = 331.43/x
  3. Step 3: Cross multiply
    605.21x = 907.81 × 331.43
  4. Step 4: Simplify right side
    605.21x = 300,870.10
  5. Step 5: Solve for x
    x = 300,870.10/605.21
  6. Step 6: Final answer
    x = 497.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.