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Finding the Fourth Proportional to 34.45, 47.31 and 28.98

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Solution

The fourth proportional to 34.45, 47.31 and 28.98 is: 39.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.45 : 47.31 = 28.98 : x
  2. Step 2: Convert to fraction form
    34.45/47.31 = 28.98/x
  3. Step 3: Cross multiply
    34.45x = 47.31 × 28.98
  4. Step 4: Simplify right side
    34.45x = 1,371.04
  5. Step 5: Solve for x
    x = 1,371.04/34.45
  6. Step 6: Final answer
    x = 39.80

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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.