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Finding the Fourth Proportional to 491.46, 677.61 and 397.86

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Solution

The fourth proportional to 491.46, 677.61 and 397.86 is: 548.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.46 : 677.61 = 397.86 : x
  2. Step 2: Convert to fraction form
    491.46/677.61 = 397.86/x
  3. Step 3: Cross multiply
    491.46x = 677.61 × 397.86
  4. Step 4: Simplify right side
    491.46x = 269,593.91
  5. Step 5: Solve for x
    x = 269,593.91/491.46
  6. Step 6: Final answer
    x = 548.56

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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.