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Finding the Fourth Proportional to 61.88, 85.41 and 39.77

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Solution

The fourth proportional to 61.88, 85.41 and 39.77 is: 54.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.88 : 85.41 = 39.77 : x
  2. Step 2: Convert to fraction form
    61.88/85.41 = 39.77/x
  3. Step 3: Cross multiply
    61.88x = 85.41 × 39.77
  4. Step 4: Simplify right side
    61.88x = 3,396.56
  5. Step 5: Solve for x
    x = 3,396.56/61.88
  6. Step 6: Final answer
    x = 54.89

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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.