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Finding the Fourth Proportional to 157.49, 217.34 and 87.54

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Solution

The fourth proportional to 157.49, 217.34 and 87.54 is: 120.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.49 : 217.34 = 87.54 : x
  2. Step 2: Convert to fraction form
    157.49/217.34 = 87.54/x
  3. Step 3: Cross multiply
    157.49x = 217.34 × 87.54
  4. Step 4: Simplify right side
    157.49x = 19,025.51
  5. Step 5: Solve for x
    x = 19,025.51/157.49
  6. Step 6: Final answer
    x = 120.81

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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.