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Finding the Fourth Proportional to 25.84, 35.60 and 20.40

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Solution

The fourth proportional to 25.84, 35.60 and 20.40 is: 28.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.84 : 35.60 = 20.40 : x
  2. Step 2: Convert to fraction form
    25.84/35.60 = 20.40/x
  3. Step 3: Cross multiply
    25.84x = 35.60 × 20.40
  4. Step 4: Simplify right side
    25.84x = 726.24
  5. Step 5: Solve for x
    x = 726.24/25.84
  6. Step 6: Final answer
    x = 28.11

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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.