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Finding the Fourth Proportional to 384.59, 576.82 and 128.09

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Solution

The fourth proportional to 384.59, 576.82 and 128.09 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.59 : 576.82 = 128.09 : x
  2. Step 2: Convert to fraction form
    384.59/576.82 = 128.09/x
  3. Step 3: Cross multiply
    384.59x = 576.82 × 128.09
  4. Step 4: Simplify right side
    384.59x = 73,884.87
  5. Step 5: Solve for x
    x = 73,884.87/384.59
  6. Step 6: Final answer
    x = 192.11

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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.