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Finding the Fourth Proportional to 105.06, 145 and 66.25

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Solution

The fourth proportional to 105.06, 145 and 66.25 is: 91.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.06 : 145 = 66.25 : x
  2. Step 2: Convert to fraction form
    105.06/145 = 66.25/x
  3. Step 3: Cross multiply
    105.06x = 145 × 66.25
  4. Step 4: Simplify right side
    105.06x = 9,606.25
  5. Step 5: Solve for x
    x = 9,606.25/105.06
  6. Step 6: Final answer
    x = 91.44

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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.