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Finding the Fourth Proportional to 22.56, 31.14 and 21.24

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Solution

The fourth proportional to 22.56, 31.14 and 21.24 is: 29.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.56 : 31.14 = 21.24 : x
  2. Step 2: Convert to fraction form
    22.56/31.14 = 21.24/x
  3. Step 3: Cross multiply
    22.56x = 31.14 × 21.24
  4. Step 4: Simplify right side
    22.56x = 661.41
  5. Step 5: Solve for x
    x = 661.41/22.56
  6. Step 6: Final answer
    x = 29.32

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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.