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Finding the Fourth Proportional to 38.52, 53.16 and 21.27

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Solution

The fourth proportional to 38.52, 53.16 and 21.27 is: 29.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.52 : 53.16 = 21.27 : x
  2. Step 2: Convert to fraction form
    38.52/53.16 = 21.27/x
  3. Step 3: Cross multiply
    38.52x = 53.16 × 21.27
  4. Step 4: Simplify right side
    38.52x = 1,130.90
  5. Step 5: Solve for x
    x = 1,130.90/38.52
  6. Step 6: Final answer
    x = 29.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.