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Finding the Fourth Proportional to 15.56, 21.43 and 15.16

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Solution

The fourth proportional to 15.56, 21.43 and 15.16 is: 20.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.56 : 21.43 = 15.16 : x
  2. Step 2: Convert to fraction form
    15.56/21.43 = 15.16/x
  3. Step 3: Cross multiply
    15.56x = 21.43 × 15.16
  4. Step 4: Simplify right side
    15.56x = 324.88
  5. Step 5: Solve for x
    x = 324.88/15.56
  6. Step 6: Final answer
    x = 20.88

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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.