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Finding the Fourth Proportional to 105.68, 145.90 and 66.90

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Solution

The fourth proportional to 105.68, 145.90 and 66.90 is: 92.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.68 : 145.90 = 66.90 : x
  2. Step 2: Convert to fraction form
    105.68/145.90 = 66.90/x
  3. Step 3: Cross multiply
    105.68x = 145.90 × 66.90
  4. Step 4: Simplify right side
    105.68x = 9,760.71
  5. Step 5: Solve for x
    x = 9,760.71/105.68
  6. Step 6: Final answer
    x = 92.36

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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.