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Finding the Fourth Proportional to 394.39, 543.13 and 357.67

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Solution

The fourth proportional to 394.39, 543.13 and 357.67 is: 492.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.39 : 543.13 = 357.67 : x
  2. Step 2: Convert to fraction form
    394.39/543.13 = 357.67/x
  3. Step 3: Cross multiply
    394.39x = 543.13 × 357.67
  4. Step 4: Simplify right side
    394.39x = 194,261.31
  5. Step 5: Solve for x
    x = 194,261.31/394.39
  6. Step 6: Final answer
    x = 492.56

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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.