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Finding the Fourth Proportional to 512.12, 767.18 and 485.88

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Solution

The fourth proportional to 512.12, 767.18 and 485.88 is: 727.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.12 : 767.18 = 485.88 : x
  2. Step 2: Convert to fraction form
    512.12/767.18 = 485.88/x
  3. Step 3: Cross multiply
    512.12x = 767.18 × 485.88
  4. Step 4: Simplify right side
    512.12x = 372,757.42
  5. Step 5: Solve for x
    x = 372,757.42/512.12
  6. Step 6: Final answer
    x = 727.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.