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Finding the Fourth Proportional to 34.50, 47.55 and 30.87

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Solution

The fourth proportional to 34.50, 47.55 and 30.87 is: 42.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.50 : 47.55 = 30.87 : x
  2. Step 2: Convert to fraction form
    34.50/47.55 = 30.87/x
  3. Step 3: Cross multiply
    34.50x = 47.55 × 30.87
  4. Step 4: Simplify right side
    34.50x = 1,467.87
  5. Step 5: Solve for x
    x = 1,467.87/34.50
  6. Step 6: Final answer
    x = 42.55

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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.