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Finding the Fourth Proportional to 157.67, 217.45 and 128.51

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Solution

The fourth proportional to 157.67, 217.45 and 128.51 is: 177.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.67 : 217.45 = 128.51 : x
  2. Step 2: Convert to fraction form
    157.67/217.45 = 128.51/x
  3. Step 3: Cross multiply
    157.67x = 217.45 × 128.51
  4. Step 4: Simplify right side
    157.67x = 27,944.50
  5. Step 5: Solve for x
    x = 27,944.50/157.67
  6. Step 6: Final answer
    x = 177.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.