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Finding the Fourth Proportional to 576.63, 864.45 and 455.45

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Solution

The fourth proportional to 576.63, 864.45 and 455.45 is: 682.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.63 : 864.45 = 455.45 : x
  2. Step 2: Convert to fraction form
    576.63/864.45 = 455.45/x
  3. Step 3: Cross multiply
    576.63x = 864.45 × 455.45
  4. Step 4: Simplify right side
    576.63x = 393,709.43
  5. Step 5: Solve for x
    x = 393,709.43/576.63
  6. Step 6: Final answer
    x = 682.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.