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Finding the Fourth Proportional to 394.62, 545 and 312.33

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Solution

The fourth proportional to 394.62, 545 and 312.33 is: 431.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.62 : 545 = 312.33 : x
  2. Step 2: Convert to fraction form
    394.62/545 = 312.33/x
  3. Step 3: Cross multiply
    394.62x = 545 × 312.33
  4. Step 4: Simplify right side
    394.62x = 170,219.85
  5. Step 5: Solve for x
    x = 170,219.85/394.62
  6. Step 6: Final answer
    x = 431.35

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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.