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Finding the Fourth Proportional to 157.11, 216.78 and 91.61

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Solution

The fourth proportional to 157.11, 216.78 and 91.61 is: 126.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.11 : 216.78 = 91.61 : x
  2. Step 2: Convert to fraction form
    157.11/216.78 = 91.61/x
  3. Step 3: Cross multiply
    157.11x = 216.78 × 91.61
  4. Step 4: Simplify right side
    157.11x = 19,858.13
  5. Step 5: Solve for x
    x = 19,858.13/157.11
  6. Step 6: Final answer
    x = 126.40

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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.