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Finding the Fourth Proportional to 61.36, 91.96 and 39.69

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Solution

The fourth proportional to 61.36, 91.96 and 39.69 is: 59.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.36 : 91.96 = 39.69 : x
  2. Step 2: Convert to fraction form
    61.36/91.96 = 39.69/x
  3. Step 3: Cross multiply
    61.36x = 91.96 × 39.69
  4. Step 4: Simplify right side
    61.36x = 3,649.79
  5. Step 5: Solve for x
    x = 3,649.79/61.36
  6. Step 6: Final answer
    x = 59.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.