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Finding the Fourth Proportional to 85.97, 128.99 and 73.22

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Solution

The fourth proportional to 85.97, 128.99 and 73.22 is: 109.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.97 : 128.99 = 73.22 : x
  2. Step 2: Convert to fraction form
    85.97/128.99 = 73.22/x
  3. Step 3: Cross multiply
    85.97x = 128.99 × 73.22
  4. Step 4: Simplify right side
    85.97x = 9,444.19
  5. Step 5: Solve for x
    x = 9,444.19/85.97
  6. Step 6: Final answer
    x = 109.85

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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.