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Finding the Fourth Proportional to 47.27, 70.85 and 21.60

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Solution

The fourth proportional to 47.27, 70.85 and 21.60 is: 32.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.27 : 70.85 = 21.60 : x
  2. Step 2: Convert to fraction form
    47.27/70.85 = 21.60/x
  3. Step 3: Cross multiply
    47.27x = 70.85 × 21.60
  4. Step 4: Simplify right side
    47.27x = 1,530.25
  5. Step 5: Solve for x
    x = 1,530.25/47.27
  6. Step 6: Final answer
    x = 32.38

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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.