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Finding the Fourth Proportional to 105.36, 145.34 and 74.36

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Solution

The fourth proportional to 105.36, 145.34 and 74.36 is: 102.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.36 : 145.34 = 74.36 : x
  2. Step 2: Convert to fraction form
    105.36/145.34 = 74.36/x
  3. Step 3: Cross multiply
    105.36x = 145.34 × 74.36
  4. Step 4: Simplify right side
    105.36x = 10,807.48
  5. Step 5: Solve for x
    x = 10,807.48/105.36
  6. Step 6: Final answer
    x = 102.58

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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.