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Finding the Fourth Proportional to 105.27, 145.20 and 74.13

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Solution

The fourth proportional to 105.27, 145.20 and 74.13 is: 102.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.27 : 145.20 = 74.13 : x
  2. Step 2: Convert to fraction form
    105.27/145.20 = 74.13/x
  3. Step 3: Cross multiply
    105.27x = 145.20 × 74.13
  4. Step 4: Simplify right side
    105.27x = 10,763.68
  5. Step 5: Solve for x
    x = 10,763.68/105.27
  6. Step 6: Final answer
    x = 102.25

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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.