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Finding the Fourth Proportional to 655.25, 903.83 and 393.21

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Solution

The fourth proportional to 655.25, 903.83 and 393.21 is: 542.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.25 : 903.83 = 393.21 : x
  2. Step 2: Convert to fraction form
    655.25/903.83 = 393.21/x
  3. Step 3: Cross multiply
    655.25x = 903.83 × 393.21
  4. Step 4: Simplify right side
    655.25x = 355,393.03
  5. Step 5: Solve for x
    x = 355,393.03/655.25
  6. Step 6: Final answer
    x = 542.38

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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.