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Finding the Fourth Proportional to 54.18, 74.79 and 39.63

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Solution

The fourth proportional to 54.18, 74.79 and 39.63 is: 54.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.18 : 74.79 = 39.63 : x
  2. Step 2: Convert to fraction form
    54.18/74.79 = 39.63/x
  3. Step 3: Cross multiply
    54.18x = 74.79 × 39.63
  4. Step 4: Simplify right side
    54.18x = 2,963.93
  5. Step 5: Solve for x
    x = 2,963.93/54.18
  6. Step 6: Final answer
    x = 54.71

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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.