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Finding the Fourth Proportional to 345.73, 518.82 and 129.31

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Solution

The fourth proportional to 345.73, 518.82 and 129.31 is: 194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.73 : 518.82 = 129.31 : x
  2. Step 2: Convert to fraction form
    345.73/518.82 = 129.31/x
  3. Step 3: Cross multiply
    345.73x = 518.82 × 129.31
  4. Step 4: Simplify right side
    345.73x = 67,088.61
  5. Step 5: Solve for x
    x = 67,088.61/345.73
  6. Step 6: Final answer
    x = 194.05

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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.