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Finding the Fourth Proportional to 287.10, 395.82 and 199.62

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Solution

The fourth proportional to 287.10, 395.82 and 199.62 is: 275.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.10 : 395.82 = 199.62 : x
  2. Step 2: Convert to fraction form
    287.10/395.82 = 199.62/x
  3. Step 3: Cross multiply
    287.10x = 395.82 × 199.62
  4. Step 4: Simplify right side
    287.10x = 79,013.59
  5. Step 5: Solve for x
    x = 79,013.59/287.10
  6. Step 6: Final answer
    x = 275.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.