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Finding the Fourth Proportional to 104.18, 155.39 and 89.57

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Solution

The fourth proportional to 104.18, 155.39 and 89.57 is: 133.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.18 : 155.39 = 89.57 : x
  2. Step 2: Convert to fraction form
    104.18/155.39 = 89.57/x
  3. Step 3: Cross multiply
    104.18x = 155.39 × 89.57
  4. Step 4: Simplify right side
    104.18x = 13,917.51
  5. Step 5: Solve for x
    x = 13,917.51/104.18
  6. Step 6: Final answer
    x = 133.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.