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Finding the Fourth Proportional to 656.40, 905.92 and 394.48

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Solution

The fourth proportional to 656.40, 905.92 and 394.48 is: 544.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.40 : 905.92 = 394.48 : x
  2. Step 2: Convert to fraction form
    656.40/905.92 = 394.48/x
  3. Step 3: Cross multiply
    656.40x = 905.92 × 394.48
  4. Step 4: Simplify right side
    656.40x = 357,367.32
  5. Step 5: Solve for x
    x = 357,367.32/656.40
  6. Step 6: Final answer
    x = 544.44

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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.