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Finding the Fourth Proportional to 64.12, 96.19 and 20.79

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Solution

The fourth proportional to 64.12, 96.19 and 20.79 is: 31.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.12 : 96.19 = 20.79 : x
  2. Step 2: Convert to fraction form
    64.12/96.19 = 20.79/x
  3. Step 3: Cross multiply
    64.12x = 96.19 × 20.79
  4. Step 4: Simplify right side
    64.12x = 1,999.79
  5. Step 5: Solve for x
    x = 1,999.79/64.12
  6. Step 6: Final answer
    x = 31.19

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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.