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Finding the Fourth Proportional to 104.50, 143.85 and 90.61

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Solution

The fourth proportional to 104.50, 143.85 and 90.61 is: 124.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.50 : 143.85 = 90.61 : x
  2. Step 2: Convert to fraction form
    104.50/143.85 = 90.61/x
  3. Step 3: Cross multiply
    104.50x = 143.85 × 90.61
  4. Step 4: Simplify right side
    104.50x = 13,034.23
  5. Step 5: Solve for x
    x = 13,034.23/104.50
  6. Step 6: Final answer
    x = 124.73

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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.