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Finding the Fourth Proportional to 30.21, 45.37 and 25.71

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Solution

The fourth proportional to 30.21, 45.37 and 25.71 is: 38.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.21 : 45.37 = 25.71 : x
  2. Step 2: Convert to fraction form
    30.21/45.37 = 25.71/x
  3. Step 3: Cross multiply
    30.21x = 45.37 × 25.71
  4. Step 4: Simplify right side
    30.21x = 1,166.46
  5. Step 5: Solve for x
    x = 1,166.46/30.21
  6. Step 6: Final answer
    x = 38.61

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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.