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Finding the Fourth Proportional to 28.13, 42.20 and 11.00

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Solution

The fourth proportional to 28.13, 42.20 and 11.00 is: 16.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.13 : 42.20 = 11.00 : x
  2. Step 2: Convert to fraction form
    28.13/42.20 = 11.00/x
  3. Step 3: Cross multiply
    28.13x = 42.20 × 11.00
  4. Step 4: Simplify right side
    28.13x = 463.93
  5. Step 5: Solve for x
    x = 463.93/28.13
  6. Step 6: Final answer
    x = 16.50

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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.