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Finding the Fourth Proportional to 345.91, 518.94 and 129.64

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Solution

The fourth proportional to 345.91, 518.94 and 129.64 is: 194.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.91 : 518.94 = 129.64 : x
  2. Step 2: Convert to fraction form
    345.91/518.94 = 129.64/x
  3. Step 3: Cross multiply
    345.91x = 518.94 × 129.64
  4. Step 4: Simplify right side
    345.91x = 67,275.38
  5. Step 5: Solve for x
    x = 67,275.38/345.91
  6. Step 6: Final answer
    x = 194.49

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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.