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Finding the Fourth Proportional to 54.08, 74.64 and 30.76

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Solution

The fourth proportional to 54.08, 74.64 and 30.76 is: 42.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.08 : 74.64 = 30.76 : x
  2. Step 2: Convert to fraction form
    54.08/74.64 = 30.76/x
  3. Step 3: Cross multiply
    54.08x = 74.64 × 30.76
  4. Step 4: Simplify right side
    54.08x = 2,295.62
  5. Step 5: Solve for x
    x = 2,295.62/54.08
  6. Step 6: Final answer
    x = 42.45

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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.