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Finding the Fourth Proportional to 104.05, 143.35 and 84.61

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Solution

The fourth proportional to 104.05, 143.35 and 84.61 is: 116.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.05 : 143.35 = 84.61 : x
  2. Step 2: Convert to fraction form
    104.05/143.35 = 84.61/x
  3. Step 3: Cross multiply
    104.05x = 143.35 × 84.61
  4. Step 4: Simplify right side
    104.05x = 12,128.84
  5. Step 5: Solve for x
    x = 12,128.84/104.05
  6. Step 6: Final answer
    x = 116.57

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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.