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Finding the Fourth Proportional to 61.58, 84.99 and 39.75

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Solution

The fourth proportional to 61.58, 84.99 and 39.75 is: 54.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.58 : 84.99 = 39.75 : x
  2. Step 2: Convert to fraction form
    61.58/84.99 = 39.75/x
  3. Step 3: Cross multiply
    61.58x = 84.99 × 39.75
  4. Step 4: Simplify right side
    61.58x = 3,378.35
  5. Step 5: Solve for x
    x = 3,378.35/61.58
  6. Step 6: Final answer
    x = 54.87

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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.