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Finding the Fourth Proportional to 104.90, 157.21 and 53.55

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Solution

The fourth proportional to 104.90, 157.21 and 53.55 is: 80.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.90 : 157.21 = 53.55 : x
  2. Step 2: Convert to fraction form
    104.90/157.21 = 53.55/x
  3. Step 3: Cross multiply
    104.90x = 157.21 × 53.55
  4. Step 4: Simplify right side
    104.90x = 8,418.33
  5. Step 5: Solve for x
    x = 8,418.33/104.90
  6. Step 6: Final answer
    x = 80.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.