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Finding the Fourth Proportional to 63.21, 94.47 and 51.20

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Solution

The fourth proportional to 63.21, 94.47 and 51.20 is: 76.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.21 : 94.47 = 51.20 : x
  2. Step 2: Convert to fraction form
    63.21/94.47 = 51.20/x
  3. Step 3: Cross multiply
    63.21x = 94.47 × 51.20
  4. Step 4: Simplify right side
    63.21x = 4,836.39
  5. Step 5: Solve for x
    x = 4,836.39/63.21
  6. Step 6: Final answer
    x = 76.51

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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.