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Finding the Fourth Proportional to 656.29, 905.96 and 394.25

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Solution

The fourth proportional to 656.29, 905.96 and 394.25 is: 544.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.29 : 905.96 = 394.25 : x
  2. Step 2: Convert to fraction form
    656.29/905.96 = 394.25/x
  3. Step 3: Cross multiply
    656.29x = 905.96 × 394.25
  4. Step 4: Simplify right side
    656.29x = 357,172.76
  5. Step 5: Solve for x
    x = 357,172.76/656.29
  6. Step 6: Final answer
    x = 544.23

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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.