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Finding the Fourth Proportional to 157.42, 236.28 and 128.88

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Solution

The fourth proportional to 157.42, 236.28 and 128.88 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.42 : 236.28 = 128.88 : x
  2. Step 2: Convert to fraction form
    157.42/236.28 = 128.88/x
  3. Step 3: Cross multiply
    157.42x = 236.28 × 128.88
  4. Step 4: Simplify right side
    157.42x = 30,451.77
  5. Step 5: Solve for x
    x = 30,451.77/157.42
  6. Step 6: Final answer
    x = 193.44

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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.