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Finding the Fourth Proportional to 105.50, 145.60 and 66.76

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Solution

The fourth proportional to 105.50, 145.60 and 66.76 is: 92.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.50 : 145.60 = 66.76 : x
  2. Step 2: Convert to fraction form
    105.50/145.60 = 66.76/x
  3. Step 3: Cross multiply
    105.50x = 145.60 × 66.76
  4. Step 4: Simplify right side
    105.50x = 9,720.26
  5. Step 5: Solve for x
    x = 9,720.26/105.50
  6. Step 6: Final answer
    x = 92.14

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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.