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Finding the Fourth Proportional to 157.70, 236.41 and 76.43

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Solution

The fourth proportional to 157.70, 236.41 and 76.43 is: 114.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.70 : 236.41 = 76.43 : x
  2. Step 2: Convert to fraction form
    157.70/236.41 = 76.43/x
  3. Step 3: Cross multiply
    157.70x = 236.41 × 76.43
  4. Step 4: Simplify right side
    157.70x = 18,068.82
  5. Step 5: Solve for x
    x = 18,068.82/157.70
  6. Step 6: Final answer
    x = 114.58

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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.