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Finding the Fourth Proportional to 64.38, 96.45 and 54.21

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Solution

The fourth proportional to 64.38, 96.45 and 54.21 is: 81.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.38 : 96.45 = 54.21 : x
  2. Step 2: Convert to fraction form
    64.38/96.45 = 54.21/x
  3. Step 3: Cross multiply
    64.38x = 96.45 × 54.21
  4. Step 4: Simplify right side
    64.38x = 5,228.55
  5. Step 5: Solve for x
    x = 5,228.55/64.38
  6. Step 6: Final answer
    x = 81.21

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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.