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Finding the Fourth Proportional to 157, 216.68 and 98.80

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Solution

The fourth proportional to 157, 216.68 and 98.80 is: 136.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    157 : 216.68 = 98.80 : x
  2. Step 2: Convert to fraction form
    157/216.68 = 98.80/x
  3. Step 3: Cross multiply
    157x = 216.68 × 98.80
  4. Step 4: Simplify right side
    157x = 21,407.98
  5. Step 5: Solve for x
    x = 21,407.98/157
  6. Step 6: Final answer
    x = 136.36

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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.