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Finding the Fourth Proportional to 265.56, 398.21 and 128.63

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Solution

The fourth proportional to 265.56, 398.21 and 128.63 is: 192.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.56 : 398.21 = 128.63 : x
  2. Step 2: Convert to fraction form
    265.56/398.21 = 128.63/x
  3. Step 3: Cross multiply
    265.56x = 398.21 × 128.63
  4. Step 4: Simplify right side
    265.56x = 51,219.12
  5. Step 5: Solve for x
    x = 51,219.12/265.56
  6. Step 6: Final answer
    x = 192.87

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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.