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Finding the Fourth Proportional to 288.10, 397.78 and 190

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Solution

The fourth proportional to 288.10, 397.78 and 190 is: 262.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.10 : 397.78 = 190 : x
  2. Step 2: Convert to fraction form
    288.10/397.78 = 190/x
  3. Step 3: Cross multiply
    288.10x = 397.78 × 190
  4. Step 4: Simplify right side
    288.10x = 75,578.20
  5. Step 5: Solve for x
    x = 75,578.20/288.10
  6. Step 6: Final answer
    x = 262.33

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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.