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Finding the Fourth Proportional to 15.36, 20.91 and 15.12

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Solution

The fourth proportional to 15.36, 20.91 and 15.12 is: 20.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.36 : 20.91 = 15.12 : x
  2. Step 2: Convert to fraction form
    15.36/20.91 = 15.12/x
  3. Step 3: Cross multiply
    15.36x = 20.91 × 15.12
  4. Step 4: Simplify right side
    15.36x = 316.16
  5. Step 5: Solve for x
    x = 316.16/15.36
  6. Step 6: Final answer
    x = 20.58

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.