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Finding the Fourth Proportional to 386.35, 533.46 and 312.55

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Solution

The fourth proportional to 386.35, 533.46 and 312.55 is: 431.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.35 : 533.46 = 312.55 : x
  2. Step 2: Convert to fraction form
    386.35/533.46 = 312.55/x
  3. Step 3: Cross multiply
    386.35x = 533.46 × 312.55
  4. Step 4: Simplify right side
    386.35x = 166,732.92
  5. Step 5: Solve for x
    x = 166,732.92/386.35
  6. Step 6: Final answer
    x = 431.56

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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.