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Finding the Fourth Proportional to 157.91, 217.80 and 98.84

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Solution

The fourth proportional to 157.91, 217.80 and 98.84 is: 136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.91 : 217.80 = 98.84 : x
  2. Step 2: Convert to fraction form
    157.91/217.80 = 98.84/x
  3. Step 3: Cross multiply
    157.91x = 217.80 × 98.84
  4. Step 4: Simplify right side
    157.91x = 21,526.26
  5. Step 5: Solve for x
    x = 21,526.26/157.91
  6. Step 6: Final answer
    x = 136.32

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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.