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Finding the Fourth Proportional to 345.58, 518.75 and 191.80

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Solution

The fourth proportional to 345.58, 518.75 and 191.80 is: 287.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.58 : 518.75 = 191.80 : x
  2. Step 2: Convert to fraction form
    345.58/518.75 = 191.80/x
  3. Step 3: Cross multiply
    345.58x = 518.75 × 191.80
  4. Step 4: Simplify right side
    345.58x = 99,496.66
  5. Step 5: Solve for x
    x = 99,496.66/345.58
  6. Step 6: Final answer
    x = 287.91

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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.