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Finding the Fourth Proportional to 25, 37.32 and 21.15

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Solution

The fourth proportional to 25, 37.32 and 21.15 is: 31.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    25 : 37.32 = 21.15 : x
  2. Step 2: Convert to fraction form
    25/37.32 = 21.15/x
  3. Step 3: Cross multiply
    25x = 37.32 × 21.15
  4. Step 4: Simplify right side
    25x = 789.32
  5. Step 5: Solve for x
    x = 789.32/25
  6. Step 6: Final answer
    x = 31.57

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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.