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Finding the Fourth Proportional to 479.86, 661.50 and 396.82

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Solution

The fourth proportional to 479.86, 661.50 and 396.82 is: 547.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.86 : 661.50 = 396.82 : x
  2. Step 2: Convert to fraction form
    479.86/661.50 = 396.82/x
  3. Step 3: Cross multiply
    479.86x = 661.50 × 396.82
  4. Step 4: Simplify right side
    479.86x = 262,496.43
  5. Step 5: Solve for x
    x = 262,496.43/479.86
  6. Step 6: Final answer
    x = 547.03

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.