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Finding the Fourth Proportional to 74.51, 111.71 and 54.31

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Solution

The fourth proportional to 74.51, 111.71 and 54.31 is: 81.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.51 : 111.71 = 54.31 : x
  2. Step 2: Convert to fraction form
    74.51/111.71 = 54.31/x
  3. Step 3: Cross multiply
    74.51x = 111.71 × 54.31
  4. Step 4: Simplify right side
    74.51x = 6,066.97
  5. Step 5: Solve for x
    x = 6,066.97/74.51
  6. Step 6: Final answer
    x = 81.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.