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Finding the Fourth Proportional to 64.28, 96.56 and 54.15

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Solution

The fourth proportional to 64.28, 96.56 and 54.15 is: 81.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 96.56 = 54.15 : x
  2. Step 2: Convert to fraction form
    64.28/96.56 = 54.15/x
  3. Step 3: Cross multiply
    64.28x = 96.56 × 54.15
  4. Step 4: Simplify right side
    64.28x = 5,228.45
  5. Step 5: Solve for x
    x = 5,228.45/64.28
  6. Step 6: Final answer
    x = 81.35

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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.