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Finding the Fourth Proportional to 45.05, 67.50 and 20.64

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Solution

The fourth proportional to 45.05, 67.50 and 20.64 is: 30.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.05 : 67.50 = 20.64 : x
  2. Step 2: Convert to fraction form
    45.05/67.50 = 20.64/x
  3. Step 3: Cross multiply
    45.05x = 67.50 × 20.64
  4. Step 4: Simplify right side
    45.05x = 1,393.20
  5. Step 5: Solve for x
    x = 1,393.20/45.05
  6. Step 6: Final answer
    x = 30.93

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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.