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Finding the Fourth Proportional to 345.44, 518.06 and 128.86

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Solution

The fourth proportional to 345.44, 518.06 and 128.86 is: 193.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.44 : 518.06 = 128.86 : x
  2. Step 2: Convert to fraction form
    345.44/518.06 = 128.86/x
  3. Step 3: Cross multiply
    345.44x = 518.06 × 128.86
  4. Step 4: Simplify right side
    345.44x = 66,757.21
  5. Step 5: Solve for x
    x = 66,757.21/345.44
  6. Step 6: Final answer
    x = 193.25

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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.