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Finding the Fourth Proportional to 30.50, 41.90 and 25.31

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Solution

The fourth proportional to 30.50, 41.90 and 25.31 is: 34.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.50 : 41.90 = 25.31 : x
  2. Step 2: Convert to fraction form
    30.50/41.90 = 25.31/x
  3. Step 3: Cross multiply
    30.50x = 41.90 × 25.31
  4. Step 4: Simplify right side
    30.50x = 1,060.34
  5. Step 5: Solve for x
    x = 1,060.34/30.50
  6. Step 6: Final answer
    x = 34.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.