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Finding the Fourth Proportional to 15.51, 21.41 and 11.88

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Solution

The fourth proportional to 15.51, 21.41 and 11.88 is: 16.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.51 : 21.41 = 11.88 : x
  2. Step 2: Convert to fraction form
    15.51/21.41 = 11.88/x
  3. Step 3: Cross multiply
    15.51x = 21.41 × 11.88
  4. Step 4: Simplify right side
    15.51x = 254.35
  5. Step 5: Solve for x
    x = 254.35/15.51
  6. Step 6: Final answer
    x = 16.40

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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.