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Finding the Fourth Proportional to 72.64, 108.94 and 21.27

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Solution

The fourth proportional to 72.64, 108.94 and 21.27 is: 31.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.64 : 108.94 = 21.27 : x
  2. Step 2: Convert to fraction form
    72.64/108.94 = 21.27/x
  3. Step 3: Cross multiply
    72.64x = 108.94 × 21.27
  4. Step 4: Simplify right side
    72.64x = 2,316.50
  5. Step 5: Solve for x
    x = 2,316.50/72.64
  6. Step 6: Final answer
    x = 31.89

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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.