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Finding the Fourth Proportional to 345.80, 518.72 and 129.32

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Solution

The fourth proportional to 345.80, 518.72 and 129.32 is: 193.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.80 : 518.72 = 129.32 : x
  2. Step 2: Convert to fraction form
    345.80/518.72 = 129.32/x
  3. Step 3: Cross multiply
    345.80x = 518.72 × 129.32
  4. Step 4: Simplify right side
    345.80x = 67,080.87
  5. Step 5: Solve for x
    x = 67,080.87/345.80
  6. Step 6: Final answer
    x = 193.99

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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.