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Finding the Fourth Proportional to 30.50, 45.85 and 28.27

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Solution

The fourth proportional to 30.50, 45.85 and 28.27 is: 42.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.50 : 45.85 = 28.27 : x
  2. Step 2: Convert to fraction form
    30.50/45.85 = 28.27/x
  3. Step 3: Cross multiply
    30.50x = 45.85 × 28.27
  4. Step 4: Simplify right side
    30.50x = 1,296.29
  5. Step 5: Solve for x
    x = 1,296.29/30.50
  6. Step 6: Final answer
    x = 42.50

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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.