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Finding the Fourth Proportional to 30.44, 45.72 and 25.91

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Solution

The fourth proportional to 30.44, 45.72 and 25.91 is: 38.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.44 : 45.72 = 25.91 : x
  2. Step 2: Convert to fraction form
    30.44/45.72 = 25.91/x
  3. Step 3: Cross multiply
    30.44x = 45.72 × 25.91
  4. Step 4: Simplify right side
    30.44x = 1,184.25
  5. Step 5: Solve for x
    x = 1,184.25/30.44
  6. Step 6: Final answer
    x = 38.90

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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.