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Finding the Fourth Proportional to 110.63, 165.90 and 85.25

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Solution

The fourth proportional to 110.63, 165.90 and 85.25 is: 127.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.63 : 165.90 = 85.25 : x
  2. Step 2: Convert to fraction form
    110.63/165.90 = 85.25/x
  3. Step 3: Cross multiply
    110.63x = 165.90 × 85.25
  4. Step 4: Simplify right side
    110.63x = 14,142.98
  5. Step 5: Solve for x
    x = 14,142.98/110.63
  6. Step 6: Final answer
    x = 127.84

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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.