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Finding the Fourth Proportional to 491.55, 676.94 and 447.74

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Solution

The fourth proportional to 491.55, 676.94 and 447.74 is: 616.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.55 : 676.94 = 447.74 : x
  2. Step 2: Convert to fraction form
    491.55/676.94 = 447.74/x
  3. Step 3: Cross multiply
    491.55x = 676.94 × 447.74
  4. Step 4: Simplify right side
    491.55x = 303,090.03
  5. Step 5: Solve for x
    x = 303,090.03/491.55
  6. Step 6: Final answer
    x = 616.61

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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.