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Finding the Fourth Proportional to 478.11, 659.43 and 394.86

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Solution

The fourth proportional to 478.11, 659.43 and 394.86 is: 544.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.11 : 659.43 = 394.86 : x
  2. Step 2: Convert to fraction form
    478.11/659.43 = 394.86/x
  3. Step 3: Cross multiply
    478.11x = 659.43 × 394.86
  4. Step 4: Simplify right side
    478.11x = 260,382.53
  5. Step 5: Solve for x
    x = 260,382.53/478.11
  6. Step 6: Final answer
    x = 544.61

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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.