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Finding the Fourth Proportional to 265.94, 398.91 and 128.95

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Solution

The fourth proportional to 265.94, 398.91 and 128.95 is: 193.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.94 : 398.91 = 128.95 : x
  2. Step 2: Convert to fraction form
    265.94/398.91 = 128.95/x
  3. Step 3: Cross multiply
    265.94x = 398.91 × 128.95
  4. Step 4: Simplify right side
    265.94x = 51,439.44
  5. Step 5: Solve for x
    x = 51,439.44/265.94
  6. Step 6: Final answer
    x = 193.43

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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.