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Finding the Fourth Proportional to 384.18, 576.36 and 140.64

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Solution

The fourth proportional to 384.18, 576.36 and 140.64 is: 210.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.18 : 576.36 = 140.64 : x
  2. Step 2: Convert to fraction form
    384.18/576.36 = 140.64/x
  3. Step 3: Cross multiply
    384.18x = 576.36 × 140.64
  4. Step 4: Simplify right side
    384.18x = 81,059.27
  5. Step 5: Solve for x
    x = 81,059.27/384.18
  6. Step 6: Final answer
    x = 210.99

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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.