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Finding the Fourth Proportional to 491.42, 676.77 and 447.61

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Solution

The fourth proportional to 491.42, 676.77 and 447.61 is: 616.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.42 : 676.77 = 447.61 : x
  2. Step 2: Convert to fraction form
    491.42/676.77 = 447.61/x
  3. Step 3: Cross multiply
    491.42x = 676.77 × 447.61
  4. Step 4: Simplify right side
    491.42x = 302,929.02
  5. Step 5: Solve for x
    x = 302,929.02/491.42
  6. Step 6: Final answer
    x = 616.44

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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.