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Finding the Fourth Proportional to 157.44, 217.17 and 98.40

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Solution

The fourth proportional to 157.44, 217.17 and 98.40 is: 135.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.44 : 217.17 = 98.40 : x
  2. Step 2: Convert to fraction form
    157.44/217.17 = 98.40/x
  3. Step 3: Cross multiply
    157.44x = 217.17 × 98.40
  4. Step 4: Simplify right side
    157.44x = 21,369.53
  5. Step 5: Solve for x
    x = 21,369.53/157.44
  6. Step 6: Final answer
    x = 135.73

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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.