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Finding the Fourth Proportional to 15.56, 23.22 and 15.20

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Solution

The fourth proportional to 15.56, 23.22 and 15.20 is: 22.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.56 : 23.22 = 15.20 : x
  2. Step 2: Convert to fraction form
    15.56/23.22 = 15.20/x
  3. Step 3: Cross multiply
    15.56x = 23.22 × 15.20
  4. Step 4: Simplify right side
    15.56x = 352.94
  5. Step 5: Solve for x
    x = 352.94/15.56
  6. Step 6: Final answer
    x = 22.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.