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Finding the Fourth Proportional to 25.61, 35.36 and 20.99

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Solution

The fourth proportional to 25.61, 35.36 and 20.99 is: 28.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.61 : 35.36 = 20.99 : x
  2. Step 2: Convert to fraction form
    25.61/35.36 = 20.99/x
  3. Step 3: Cross multiply
    25.61x = 35.36 × 20.99
  4. Step 4: Simplify right side
    25.61x = 741.92
  5. Step 5: Solve for x
    x = 741.92/25.61
  6. Step 6: Final answer
    x = 28.98

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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.