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Finding the Fourth Proportional to 394.80, 544.08 and 315.84

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Solution

The fourth proportional to 394.80, 544.08 and 315.84 is: 435.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 544.08 = 315.84 : x
  2. Step 2: Convert to fraction form
    394.80/544.08 = 315.84/x
  3. Step 3: Cross multiply
    394.80x = 544.08 × 315.84
  4. Step 4: Simplify right side
    394.80x = 171,842.23
  5. Step 5: Solve for x
    x = 171,842.23/394.80
  6. Step 6: Final answer
    x = 435.26

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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.