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Finding the Fourth Proportional to 61.33, 84.60 and 54.79

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Solution

The fourth proportional to 61.33, 84.60 and 54.79 is: 75.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.33 : 84.60 = 54.79 : x
  2. Step 2: Convert to fraction form
    61.33/84.60 = 54.79/x
  3. Step 3: Cross multiply
    61.33x = 84.60 × 54.79
  4. Step 4: Simplify right side
    61.33x = 4,635.23
  5. Step 5: Solve for x
    x = 4,635.23/61.33
  6. Step 6: Final answer
    x = 75.58

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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.