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Finding the Fourth Proportional to 35.52, 53.31 and 20.31

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Solution

The fourth proportional to 35.52, 53.31 and 20.31 is: 30.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.52 : 53.31 = 20.31 : x
  2. Step 2: Convert to fraction form
    35.52/53.31 = 20.31/x
  3. Step 3: Cross multiply
    35.52x = 53.31 × 20.31
  4. Step 4: Simplify right side
    35.52x = 1,082.73
  5. Step 5: Solve for x
    x = 1,082.73/35.52
  6. Step 6: Final answer
    x = 30.48

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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.