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Finding the Fourth Proportional to 74.45, 111.65 and 45.56

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Solution

The fourth proportional to 74.45, 111.65 and 45.56 is: 68.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.45 : 111.65 = 45.56 : x
  2. Step 2: Convert to fraction form
    74.45/111.65 = 45.56/x
  3. Step 3: Cross multiply
    74.45x = 111.65 × 45.56
  4. Step 4: Simplify right side
    74.45x = 5,086.83
  5. Step 5: Solve for x
    x = 5,086.83/74.45
  6. Step 6: Final answer
    x = 68.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.