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Finding the Fourth Proportional to 262.28, 391.92 and 188.80

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Solution

The fourth proportional to 262.28, 391.92 and 188.80 is: 282.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.28 : 391.92 = 188.80 : x
  2. Step 2: Convert to fraction form
    262.28/391.92 = 188.80/x
  3. Step 3: Cross multiply
    262.28x = 391.92 × 188.80
  4. Step 4: Simplify right side
    262.28x = 73,994.50
  5. Step 5: Solve for x
    x = 73,994.50/262.28
  6. Step 6: Final answer
    x = 282.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.