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Finding the Fourth Proportional to 157.94, 217.98 and 121.02

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Solution

The fourth proportional to 157.94, 217.98 and 121.02 is: 167.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.94 : 217.98 = 121.02 : x
  2. Step 2: Convert to fraction form
    157.94/217.98 = 121.02/x
  3. Step 3: Cross multiply
    157.94x = 217.98 × 121.02
  4. Step 4: Simplify right side
    157.94x = 26,379.94
  5. Step 5: Solve for x
    x = 26,379.94/157.94
  6. Step 6: Final answer
    x = 167.03

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