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Finding the Fourth Proportional to 54.13, 74.68 and 30.81

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Solution

The fourth proportional to 54.13, 74.68 and 30.81 is: 42.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.13 : 74.68 = 30.81 : x
  2. Step 2: Convert to fraction form
    54.13/74.68 = 30.81/x
  3. Step 3: Cross multiply
    54.13x = 74.68 × 30.81
  4. Step 4: Simplify right side
    54.13x = 2,300.44
  5. Step 5: Solve for x
    x = 2,300.44/54.13
  6. Step 6: Final answer
    x = 42.50

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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.