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Finding the Fourth Proportional to 54.12, 74.64 and 36.60

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Solution

The fourth proportional to 54.12, 74.64 and 36.60 is: 50.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.12 : 74.64 = 36.60 : x
  2. Step 2: Convert to fraction form
    54.12/74.64 = 36.60/x
  3. Step 3: Cross multiply
    54.12x = 74.64 × 36.60
  4. Step 4: Simplify right side
    54.12x = 2,731.82
  5. Step 5: Solve for x
    x = 2,731.82/54.12
  6. Step 6: Final answer
    x = 50.48

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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.