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Finding the Fourth Proportional to 25.80, 38.73 and 21.53

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Solution

The fourth proportional to 25.80, 38.73 and 21.53 is: 32.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.80 : 38.73 = 21.53 : x
  2. Step 2: Convert to fraction form
    25.80/38.73 = 21.53/x
  3. Step 3: Cross multiply
    25.80x = 38.73 × 21.53
  4. Step 4: Simplify right side
    25.80x = 833.91
  5. Step 5: Solve for x
    x = 833.91/25.80
  6. Step 6: Final answer
    x = 32.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.