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Finding the Fourth Proportional to 61.38, 84.60 and 57.33

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Solution

The fourth proportional to 61.38, 84.60 and 57.33 is: 79.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.38 : 84.60 = 57.33 : x
  2. Step 2: Convert to fraction form
    61.38/84.60 = 57.33/x
  3. Step 3: Cross multiply
    61.38x = 84.60 × 57.33
  4. Step 4: Simplify right side
    61.38x = 4,850.12
  5. Step 5: Solve for x
    x = 4,850.12/61.38
  6. Step 6: Final answer
    x = 79.02

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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.