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Finding the Fourth Proportional to 656.61, 905.85 and 394.64

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Solution

The fourth proportional to 656.61, 905.85 and 394.64 is: 544.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.61 : 905.85 = 394.64 : x
  2. Step 2: Convert to fraction form
    656.61/905.85 = 394.64/x
  3. Step 3: Cross multiply
    656.61x = 905.85 × 394.64
  4. Step 4: Simplify right side
    656.61x = 357,480.11
  5. Step 5: Solve for x
    x = 357,480.11/656.61
  6. Step 6: Final answer
    x = 544.43

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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.