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Finding the Fourth Proportional to 63.05, 87.36 and 61.68

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Solution

The fourth proportional to 63.05, 87.36 and 61.68 is: 85.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.05 : 87.36 = 61.68 : x
  2. Step 2: Convert to fraction form
    63.05/87.36 = 61.68/x
  3. Step 3: Cross multiply
    63.05x = 87.36 × 61.68
  4. Step 4: Simplify right side
    63.05x = 5,388.69
  5. Step 5: Solve for x
    x = 5,388.69/63.05
  6. Step 6: Final answer
    x = 85.47

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.