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Finding the Fourth Proportional to 64.31, 96.47 and 20.96

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Solution

The fourth proportional to 64.31, 96.47 and 20.96 is: 31.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.31 : 96.47 = 20.96 : x
  2. Step 2: Convert to fraction form
    64.31/96.47 = 20.96/x
  3. Step 3: Cross multiply
    64.31x = 96.47 × 20.96
  4. Step 4: Simplify right side
    64.31x = 2,022.31
  5. Step 5: Solve for x
    x = 2,022.31/64.31
  6. Step 6: Final answer
    x = 31.45

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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.