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Finding the Fourth Proportional to 25.99, 38.76 and 21.13

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Solution

The fourth proportional to 25.99, 38.76 and 21.13 is: 31.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.99 : 38.76 = 21.13 : x
  2. Step 2: Convert to fraction form
    25.99/38.76 = 21.13/x
  3. Step 3: Cross multiply
    25.99x = 38.76 × 21.13
  4. Step 4: Simplify right side
    25.99x = 818.94
  5. Step 5: Solve for x
    x = 818.94/25.99
  6. Step 6: Final answer
    x = 31.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.