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Finding the Fourth Proportional to 30.30, 41.78 and 28.59

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Solution

The fourth proportional to 30.30, 41.78 and 28.59 is: 39.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.30 : 41.78 = 28.59 : x
  2. Step 2: Convert to fraction form
    30.30/41.78 = 28.59/x
  3. Step 3: Cross multiply
    30.30x = 41.78 × 28.59
  4. Step 4: Simplify right side
    30.30x = 1,194.56
  5. Step 5: Solve for x
    x = 1,194.56/30.30
  6. Step 6: Final answer
    x = 39.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.