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Finding the Fourth Proportional to 157.25, 217.55 and 153.78

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Solution

The fourth proportional to 157.25, 217.55 and 153.78 is: 212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.25 : 217.55 = 153.78 : x
  2. Step 2: Convert to fraction form
    157.25/217.55 = 153.78/x
  3. Step 3: Cross multiply
    157.25x = 217.55 × 153.78
  4. Step 4: Simplify right side
    157.25x = 33,455.22
  5. Step 5: Solve for x
    x = 33,455.22/157.25
  6. Step 6: Final answer
    x = 212.76

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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.