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Finding the Fourth Proportional to 104.21, 157.22 and 99.16

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Solution

The fourth proportional to 104.21, 157.22 and 99.16 is: 149.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.21 : 157.22 = 99.16 : x
  2. Step 2: Convert to fraction form
    104.21/157.22 = 99.16/x
  3. Step 3: Cross multiply
    104.21x = 157.22 × 99.16
  4. Step 4: Simplify right side
    104.21x = 15,589.94
  5. Step 5: Solve for x
    x = 15,589.94/104.21
  6. Step 6: Final answer
    x = 149.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.