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Finding the Fourth Proportional to 76.44, 105.26 and 64.11

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Solution

The fourth proportional to 76.44, 105.26 and 64.11 is: 88.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.44 : 105.26 = 64.11 : x
  2. Step 2: Convert to fraction form
    76.44/105.26 = 64.11/x
  3. Step 3: Cross multiply
    76.44x = 105.26 × 64.11
  4. Step 4: Simplify right side
    76.44x = 6,747.90
  5. Step 5: Solve for x
    x = 6,747.90/76.44
  6. Step 6: Final answer
    x = 88.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.