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Finding the Fourth Proportional to 264.98, 397.08 and 128.09

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Solution

The fourth proportional to 264.98, 397.08 and 128.09 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.98 : 397.08 = 128.09 : x
  2. Step 2: Convert to fraction form
    264.98/397.08 = 128.09/x
  3. Step 3: Cross multiply
    264.98x = 397.08 × 128.09
  4. Step 4: Simplify right side
    264.98x = 50,861.98
  5. Step 5: Solve for x
    x = 50,861.98/264.98
  6. Step 6: Final answer
    x = 191.95

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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.