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Finding the Fourth Proportional to 656.44, 905.88 and 394.47

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Solution

The fourth proportional to 656.44, 905.88 and 394.47 is: 544.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.44 : 905.88 = 394.47 : x
  2. Step 2: Convert to fraction form
    656.44/905.88 = 394.47/x
  3. Step 3: Cross multiply
    656.44x = 905.88 × 394.47
  4. Step 4: Simplify right side
    656.44x = 357,343.96
  5. Step 5: Solve for x
    x = 357,343.96/656.44
  6. Step 6: Final answer
    x = 544.37

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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.