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Finding the Fourth Proportional to 53.88, 80.80 and 21.36

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Solution

The fourth proportional to 53.88, 80.80 and 21.36 is: 32.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.88 : 80.80 = 21.36 : x
  2. Step 2: Convert to fraction form
    53.88/80.80 = 21.36/x
  3. Step 3: Cross multiply
    53.88x = 80.80 × 21.36
  4. Step 4: Simplify right side
    53.88x = 1,726.01
  5. Step 5: Solve for x
    x = 1,726.01/53.88
  6. Step 6: Final answer
    x = 32.04

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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.