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Finding the Fourth Proportional to 85.45, 128.14 and 44.87

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Solution

The fourth proportional to 85.45, 128.14 and 44.87 is: 67.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.45 : 128.14 = 44.87 : x
  2. Step 2: Convert to fraction form
    85.45/128.14 = 44.87/x
  3. Step 3: Cross multiply
    85.45x = 128.14 × 44.87
  4. Step 4: Simplify right side
    85.45x = 5,749.64
  5. Step 5: Solve for x
    x = 5,749.64/85.45
  6. Step 6: Final answer
    x = 67.29

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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.