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Finding the Fourth Proportional to 418.21, 576.75 and 285.64

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Solution

The fourth proportional to 418.21, 576.75 and 285.64 is: 393.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.21 : 576.75 = 285.64 : x
  2. Step 2: Convert to fraction form
    418.21/576.75 = 285.64/x
  3. Step 3: Cross multiply
    418.21x = 576.75 × 285.64
  4. Step 4: Simplify right side
    418.21x = 164,741.43
  5. Step 5: Solve for x
    x = 164,741.43/418.21
  6. Step 6: Final answer
    x = 393.92

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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.