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Finding the Fourth Proportional to 104.79, 143.94 and 86.33

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Solution

The fourth proportional to 104.79, 143.94 and 86.33 is: 118.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.79 : 143.94 = 86.33 : x
  2. Step 2: Convert to fraction form
    104.79/143.94 = 86.33/x
  3. Step 3: Cross multiply
    104.79x = 143.94 × 86.33
  4. Step 4: Simplify right side
    104.79x = 12,427.02
  5. Step 5: Solve for x
    x = 12,427.02/104.79
  6. Step 6: Final answer
    x = 118.59

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.