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Finding the Fourth Proportional to 104.89, 157.49 and 90.55

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Solution

The fourth proportional to 104.89, 157.49 and 90.55 is: 135.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.89 : 157.49 = 90.55 : x
  2. Step 2: Convert to fraction form
    104.89/157.49 = 90.55/x
  3. Step 3: Cross multiply
    104.89x = 157.49 × 90.55
  4. Step 4: Simplify right side
    104.89x = 14,260.66
  5. Step 5: Solve for x
    x = 14,260.66/104.89
  6. Step 6: Final answer
    x = 135.96

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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.