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Finding the Fourth Proportional to 66.79, 100.15 and 28.28

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Solution

The fourth proportional to 66.79, 100.15 and 28.28 is: 42.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.79 : 100.15 = 28.28 : x
  2. Step 2: Convert to fraction form
    66.79/100.15 = 28.28/x
  3. Step 3: Cross multiply
    66.79x = 100.15 × 28.28
  4. Step 4: Simplify right side
    66.79x = 2,832.24
  5. Step 5: Solve for x
    x = 2,832.24/66.79
  6. Step 6: Final answer
    x = 42.41

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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.