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Finding the Fourth Proportional to 345.47, 518.20 and 191.36

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Solution

The fourth proportional to 345.47, 518.20 and 191.36 is: 287.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.47 : 518.20 = 191.36 : x
  2. Step 2: Convert to fraction form
    345.47/518.20 = 191.36/x
  3. Step 3: Cross multiply
    345.47x = 518.20 × 191.36
  4. Step 4: Simplify right side
    345.47x = 99,163.57
  5. Step 5: Solve for x
    x = 99,163.57/345.47
  6. Step 6: Final answer
    x = 287.04

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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.