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Finding the Fourth Proportional to 345.40, 518.56 and 199.28

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Solution

The fourth proportional to 345.40, 518.56 and 199.28 is: 299.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.40 : 518.56 = 199.28 : x
  2. Step 2: Convert to fraction form
    345.40/518.56 = 199.28/x
  3. Step 3: Cross multiply
    345.40x = 518.56 × 199.28
  4. Step 4: Simplify right side
    345.40x = 103,339.43
  5. Step 5: Solve for x
    x = 103,339.43/345.40
  6. Step 6: Final answer
    x = 299.19

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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.