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Finding the Fourth Proportional to 345.85, 518.68 and 129.31

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Solution

The fourth proportional to 345.85, 518.68 and 129.31 is: 193.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.85 : 518.68 = 129.31 : x
  2. Step 2: Convert to fraction form
    345.85/518.68 = 129.31/x
  3. Step 3: Cross multiply
    345.85x = 518.68 × 129.31
  4. Step 4: Simplify right side
    345.85x = 67,070.51
  5. Step 5: Solve for x
    x = 67,070.51/345.85
  6. Step 6: Final answer
    x = 193.93

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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.