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Finding the Fourth Proportional to 42.05, 63.00 and 20.35

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Solution

The fourth proportional to 42.05, 63.00 and 20.35 is: 30.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.05 : 63.00 = 20.35 : x
  2. Step 2: Convert to fraction form
    42.05/63.00 = 20.35/x
  3. Step 3: Cross multiply
    42.05x = 63.00 × 20.35
  4. Step 4: Simplify right side
    42.05x = 1,282.09
  5. Step 5: Solve for x
    x = 1,282.09/42.05
  6. Step 6: Final answer
    x = 30.49

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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.