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Finding the Fourth Proportional to 655.90, 905.07 and 376.21

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Solution

The fourth proportional to 655.90, 905.07 and 376.21 is: 519.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.90 : 905.07 = 376.21 : x
  2. Step 2: Convert to fraction form
    655.90/905.07 = 376.21/x
  3. Step 3: Cross multiply
    655.90x = 905.07 × 376.21
  4. Step 4: Simplify right side
    655.90x = 340,496.38
  5. Step 5: Solve for x
    x = 340,496.38/655.90
  6. Step 6: Final answer
    x = 519.13

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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.