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Finding the Fourth Proportional to 394.17, 543.39 and 315.72

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Solution

The fourth proportional to 394.17, 543.39 and 315.72 is: 435.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.17 : 543.39 = 315.72 : x
  2. Step 2: Convert to fraction form
    394.17/543.39 = 315.72/x
  3. Step 3: Cross multiply
    394.17x = 543.39 × 315.72
  4. Step 4: Simplify right side
    394.17x = 171,559.09
  5. Step 5: Solve for x
    x = 171,559.09/394.17
  6. Step 6: Final answer
    x = 435.24

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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.