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Finding the Fourth Proportional to 15.16, 21.11 and 15.16

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Solution

The fourth proportional to 15.16, 21.11 and 15.16 is: 21.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.16 : 21.11 = 15.16 : x
  2. Step 2: Convert to fraction form
    15.16/21.11 = 15.16/x
  3. Step 3: Cross multiply
    15.16x = 21.11 × 15.16
  4. Step 4: Simplify right side
    15.16x = 320.03
  5. Step 5: Solve for x
    x = 320.03/15.16
  6. Step 6: Final answer
    x = 21.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.