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Finding the Fourth Proportional to 63.99, 95.21 and 61.76

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Solution

The fourth proportional to 63.99, 95.21 and 61.76 is: 91.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.99 : 95.21 = 61.76 : x
  2. Step 2: Convert to fraction form
    63.99/95.21 = 61.76/x
  3. Step 3: Cross multiply
    63.99x = 95.21 × 61.76
  4. Step 4: Simplify right side
    63.99x = 5,880.33
  5. Step 5: Solve for x
    x = 5,880.33/63.99
  6. Step 6: Final answer
    x = 91.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.