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Finding the Fourth Proportional to 384.64, 576.64 and 128

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Solution

The fourth proportional to 384.64, 576.64 and 128 is: 191.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.64 : 576.64 = 128 : x
  2. Step 2: Convert to fraction form
    384.64/576.64 = 128/x
  3. Step 3: Cross multiply
    384.64x = 576.64 × 128
  4. Step 4: Simplify right side
    384.64x = 73,809.92
  5. Step 5: Solve for x
    x = 73,809.92/384.64
  6. Step 6: Final answer
    x = 191.89

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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.