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Finding the Fourth Proportional to 345.27, 518.03 and 128.79

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Solution

The fourth proportional to 345.27, 518.03 and 128.79 is: 193.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.27 : 518.03 = 128.79 : x
  2. Step 2: Convert to fraction form
    345.27/518.03 = 128.79/x
  3. Step 3: Cross multiply
    345.27x = 518.03 × 128.79
  4. Step 4: Simplify right side
    345.27x = 66,718.70
  5. Step 5: Solve for x
    x = 66,718.70/345.27
  6. Step 6: Final answer
    x = 193.24

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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.