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Finding the Fourth Proportional to 115.59, 173.32 and 85.27

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Solution

The fourth proportional to 115.59, 173.32 and 85.27 is: 127.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.59 : 173.32 = 85.27 : x
  2. Step 2: Convert to fraction form
    115.59/173.32 = 85.27/x
  3. Step 3: Cross multiply
    115.59x = 173.32 × 85.27
  4. Step 4: Simplify right side
    115.59x = 14,779.00
  5. Step 5: Solve for x
    x = 14,779.00/115.59
  6. Step 6: Final answer
    x = 127.86

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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.