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Finding the Fourth Proportional to 25.79, 35.58 and 15.43

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Solution

The fourth proportional to 25.79, 35.58 and 15.43 is: 21.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.79 : 35.58 = 15.43 : x
  2. Step 2: Convert to fraction form
    25.79/35.58 = 15.43/x
  3. Step 3: Cross multiply
    25.79x = 35.58 × 15.43
  4. Step 4: Simplify right side
    25.79x = 548.91
  5. Step 5: Solve for x
    x = 548.91/25.79
  6. Step 6: Final answer
    x = 21.28

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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.