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Finding the Fourth Proportional to 64.21, 96.31 and 18.56

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Solution

The fourth proportional to 64.21, 96.31 and 18.56 is: 27.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.21 : 96.31 = 18.56 : x
  2. Step 2: Convert to fraction form
    64.21/96.31 = 18.56/x
  3. Step 3: Cross multiply
    64.21x = 96.31 × 18.56
  4. Step 4: Simplify right side
    64.21x = 1,787.50
  5. Step 5: Solve for x
    x = 1,787.50/64.21
  6. Step 6: Final answer
    x = 27.84

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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.