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Finding the Fourth Proportional to 345.87, 518.83 and 102.42

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Solution

The fourth proportional to 345.87, 518.83 and 102.42 is: 153.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.87 : 518.83 = 102.42 : x
  2. Step 2: Convert to fraction form
    345.87/518.83 = 102.42/x
  3. Step 3: Cross multiply
    345.87x = 518.83 × 102.42
  4. Step 4: Simplify right side
    345.87x = 53,138.57
  5. Step 5: Solve for x
    x = 53,138.57/345.87
  6. Step 6: Final answer
    x = 153.64

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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.