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Finding the Fourth Proportional to 157.98, 217.98 and 121.08

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Solution

The fourth proportional to 157.98, 217.98 and 121.08 is: 167.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.98 : 217.98 = 121.08 : x
  2. Step 2: Convert to fraction form
    157.98/217.98 = 121.08/x
  3. Step 3: Cross multiply
    157.98x = 217.98 × 121.08
  4. Step 4: Simplify right side
    157.98x = 26,393.02
  5. Step 5: Solve for x
    x = 26,393.02/157.98
  6. Step 6: Final answer
    x = 167.07

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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.