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Finding the Fourth Proportional to 54.21, 74.81 and 29.65

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Solution

The fourth proportional to 54.21, 74.81 and 29.65 is: 40.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.21 : 74.81 = 29.65 : x
  2. Step 2: Convert to fraction form
    54.21/74.81 = 29.65/x
  3. Step 3: Cross multiply
    54.21x = 74.81 × 29.65
  4. Step 4: Simplify right side
    54.21x = 2,217.91
  5. Step 5: Solve for x
    x = 2,217.91/54.21
  6. Step 6: Final answer
    x = 40.91

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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.