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Finding the Fourth Proportional to 345.86, 518.89 and 102.39

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Solution

The fourth proportional to 345.86, 518.89 and 102.39 is: 153.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.86 : 518.89 = 102.39 : x
  2. Step 2: Convert to fraction form
    345.86/518.89 = 102.39/x
  3. Step 3: Cross multiply
    345.86x = 518.89 × 102.39
  4. Step 4: Simplify right side
    345.86x = 53,130.93
  5. Step 5: Solve for x
    x = 53,130.93/345.86
  6. Step 6: Final answer
    x = 153.62

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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.