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Finding the Fourth Proportional to 157.91, 217.95 and 99.68

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Solution

The fourth proportional to 157.91, 217.95 and 99.68 is: 137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.91 : 217.95 = 99.68 : x
  2. Step 2: Convert to fraction form
    157.91/217.95 = 99.68/x
  3. Step 3: Cross multiply
    157.91x = 217.95 × 99.68
  4. Step 4: Simplify right side
    157.91x = 21,725.26
  5. Step 5: Solve for x
    x = 21,725.26/157.91
  6. Step 6: Final answer
    x = 137.58

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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.