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Finding the Fourth Proportional to 75.51, 104.31 and 61.11

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Solution

The fourth proportional to 75.51, 104.31 and 61.11 is: 84.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.51 : 104.31 = 61.11 : x
  2. Step 2: Convert to fraction form
    75.51/104.31 = 61.11/x
  3. Step 3: Cross multiply
    75.51x = 104.31 × 61.11
  4. Step 4: Simplify right side
    75.51x = 6,374.38
  5. Step 5: Solve for x
    x = 6,374.38/75.51
  6. Step 6: Final answer
    x = 84.42

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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.