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Finding the Fourth Proportional to 157.72, 236.42 and 85.56

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Solution

The fourth proportional to 157.72, 236.42 and 85.56 is: 128.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.72 : 236.42 = 85.56 : x
  2. Step 2: Convert to fraction form
    157.72/236.42 = 85.56/x
  3. Step 3: Cross multiply
    157.72x = 236.42 × 85.56
  4. Step 4: Simplify right side
    157.72x = 20,228.10
  5. Step 5: Solve for x
    x = 20,228.10/157.72
  6. Step 6: Final answer
    x = 128.25

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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.