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Finding the Fourth Proportional to 100.96, 139.44 and 89.44

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Solution

The fourth proportional to 100.96, 139.44 and 89.44 is: 123.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.96 : 139.44 = 89.44 : x
  2. Step 2: Convert to fraction form
    100.96/139.44 = 89.44/x
  3. Step 3: Cross multiply
    100.96x = 139.44 × 89.44
  4. Step 4: Simplify right side
    100.96x = 12,471.51
  5. Step 5: Solve for x
    x = 12,471.51/100.96
  6. Step 6: Final answer
    x = 123.53

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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.