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Finding the Fourth Proportional to 157.18, 216.81 and 120.22

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Solution

The fourth proportional to 157.18, 216.81 and 120.22 is: 165.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.18 : 216.81 = 120.22 : x
  2. Step 2: Convert to fraction form
    157.18/216.81 = 120.22/x
  3. Step 3: Cross multiply
    157.18x = 216.81 × 120.22
  4. Step 4: Simplify right side
    157.18x = 26,064.90
  5. Step 5: Solve for x
    x = 26,064.90/157.18
  6. Step 6: Final answer
    x = 165.83

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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.