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Finding the Fourth Proportional to 157.20, 216.80 and 91.68

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Solution

The fourth proportional to 157.20, 216.80 and 91.68 is: 126.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.20 : 216.80 = 91.68 : x
  2. Step 2: Convert to fraction form
    157.20/216.80 = 91.68/x
  3. Step 3: Cross multiply
    157.20x = 216.80 × 91.68
  4. Step 4: Simplify right side
    157.20x = 19,876.22
  5. Step 5: Solve for x
    x = 19,876.22/157.20
  6. Step 6: Final answer
    x = 126.44

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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.