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Finding the Fourth Proportional to 394.16, 544.88 and 390.48

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Solution

The fourth proportional to 394.16, 544.88 and 390.48 is: 539.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.16 : 544.88 = 390.48 : x
  2. Step 2: Convert to fraction form
    394.16/544.88 = 390.48/x
  3. Step 3: Cross multiply
    394.16x = 544.88 × 390.48
  4. Step 4: Simplify right side
    394.16x = 212,764.74
  5. Step 5: Solve for x
    x = 212,764.74/394.16
  6. Step 6: Final answer
    x = 539.79

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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.