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Finding the Fourth Proportional to 265.44, 398.06 and 128.45

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Solution

The fourth proportional to 265.44, 398.06 and 128.45 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.44 : 398.06 = 128.45 : x
  2. Step 2: Convert to fraction form
    265.44/398.06 = 128.45/x
  3. Step 3: Cross multiply
    265.44x = 398.06 × 128.45
  4. Step 4: Simplify right side
    265.44x = 51,128.17
  5. Step 5: Solve for x
    x = 51,128.17/265.44
  6. Step 6: Final answer
    x = 192.62

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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.