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Finding the Fourth Proportional to 345.50, 518.40 and 129.02

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Solution

The fourth proportional to 345.50, 518.40 and 129.02 is: 193.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.50 : 518.40 = 129.02 : x
  2. Step 2: Convert to fraction form
    345.50/518.40 = 129.02/x
  3. Step 3: Cross multiply
    345.50x = 518.40 × 129.02
  4. Step 4: Simplify right side
    345.50x = 66,883.97
  5. Step 5: Solve for x
    x = 66,883.97/345.50
  6. Step 6: Final answer
    x = 193.59

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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.