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Finding the Fourth Proportional to 105.75, 145.92 and 74.76

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Solution

The fourth proportional to 105.75, 145.92 and 74.76 is: 103.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.75 : 145.92 = 74.76 : x
  2. Step 2: Convert to fraction form
    105.75/145.92 = 74.76/x
  3. Step 3: Cross multiply
    105.75x = 145.92 × 74.76
  4. Step 4: Simplify right side
    105.75x = 10,908.98
  5. Step 5: Solve for x
    x = 10,908.98/105.75
  6. Step 6: Final answer
    x = 103.16

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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.