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Finding the Fourth Proportional to 157.55, 236.36 and 80.45

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Solution

The fourth proportional to 157.55, 236.36 and 80.45 is: 120.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.55 : 236.36 = 80.45 : x
  2. Step 2: Convert to fraction form
    157.55/236.36 = 80.45/x
  3. Step 3: Cross multiply
    157.55x = 236.36 × 80.45
  4. Step 4: Simplify right side
    157.55x = 19,015.16
  5. Step 5: Solve for x
    x = 19,015.16/157.55
  6. Step 6: Final answer
    x = 120.69

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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.