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Finding the Fourth Proportional to 655.92, 905.06 and 393.88

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Solution

The fourth proportional to 655.92, 905.06 and 393.88 is: 543.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.92 : 905.06 = 393.88 : x
  2. Step 2: Convert to fraction form
    655.92/905.06 = 393.88/x
  3. Step 3: Cross multiply
    655.92x = 905.06 × 393.88
  4. Step 4: Simplify right side
    655.92x = 356,485.03
  5. Step 5: Solve for x
    x = 356,485.03/655.92
  6. Step 6: Final answer
    x = 543.49

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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.