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Finding the Fourth Proportional to 47.25, 70.92 and 28.08

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Solution

The fourth proportional to 47.25, 70.92 and 28.08 is: 42.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.25 : 70.92 = 28.08 : x
  2. Step 2: Convert to fraction form
    47.25/70.92 = 28.08/x
  3. Step 3: Cross multiply
    47.25x = 70.92 × 28.08
  4. Step 4: Simplify right side
    47.25x = 1,991.43
  5. Step 5: Solve for x
    x = 1,991.43/47.25
  6. Step 6: Final answer
    x = 42.15

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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.