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Finding the Fourth Proportional to 25.28, 34.91 and 21.21

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Solution

The fourth proportional to 25.28, 34.91 and 21.21 is: 29.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.28 : 34.91 = 21.21 : x
  2. Step 2: Convert to fraction form
    25.28/34.91 = 21.21/x
  3. Step 3: Cross multiply
    25.28x = 34.91 × 21.21
  4. Step 4: Simplify right side
    25.28x = 740.16
  5. Step 5: Solve for x
    x = 740.16/25.28
  6. Step 6: Final answer
    x = 29.28

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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.